ian appelbaum · ian appelbaum curriculum vitae address physical sciences complex, university of...

Ian AppelbaumCurriculum Vitae

Address Physical Sciences Complex, University of Maryland, College Park

Phone (301) 337-7461

Mail [email protected]

WWW http://appelbaum.physics.umd.edu

APPOINTMENTS

2009-present

University of Maryland, College Park

Experimental Semiconductor Physics Research: spin-polarized electron transport in Si andGe, methods for topological insulator surface states and Majorana fermion detection

Teaching: Solid-State Physics, Quantum Mechanics, Optics, and Scientific Computing

Affiliate Associate Professor of Electrical and Computer Engineering

Visiting Scholar Spring 2013Harvard University

Research on Majorana fermion detection during sabbatical semester with Prof. A. Yacoby

Assistant Professor of Electrical Engineering 2004-2008University of Delaware

Research on optoelectronic devices, STM/BEEM, UHV wafer bonding, spin injection/ de-tection

Teaching courses on Device Physics, Wave Physics, and Spintronics/ Magnetoelectronics

Postdoctoral Fellow 2003-2004Harvard University

Division of Engineering and Applied Sciences, Narayanamurti Lab: research on hot electrontransport in metallic thin films for thermoelectric devices and materials

EDUCATION

PhD Physics 1998-2003Massachusetts Institute of Technology

Ballistic Electrons: Microscopy, Spectroscopy, Devices and Luminescence

Thesis advisor: V. Narayanamurti (Harvard) / J.D. Joannopoulos (MIT)

BS Physics and Mathematics 1994-1997Rensselaer Polytechnic Institute

Summa Cum Laude. Academic/Research advisors: X.-C. Zhang and P.D. Persans

June 19, 2015

Research

Ian Appelbaum

1 Scientific focus

Electrons have electric charge but also carry both intrinsic angular momentum (called spin) andan associated magnetic moment. Unlike the scalar charge, spin is a vector-like quantity that pointsin a given direction, and hence the nature of its interaction with other electronic degrees of freedomis fundamentally different.

My interests within solid-state device physics mostly pertain to the flow of this spin through oth-erwise nonmagnetic semiconductors, where under normal circumstances there are equal numbersof spins aligned or anti-aligned along any given axis. Forcing electrons to move across carefully-controlled interfaces between appropriate materials can, however, create an imbalance of spin di-rections or polarization out of equilibrium. One motivation for this topic choice is that thereare potentially several practical applications of spin-electronics where spin orientation is controlledthrough real or effective magnetic field coupling to the magnetic moment. My hope is that we areworking toward a time when this science enables an essential technology, much as a thorough un-derstanding of charge transport in semiconductors built throughout the middle of the 20th centuryled directly to the development of electronic devices and the information age we now enjoy. Thus,I have focused my research not on exotic substances but rather the same materials basis for con-ventional electronics (elemental semiconductors such as silicon and germanium, and more recently,2-dimensional layers of phosphorus).

As an assistant professor of Electrical Engineering at another university, I developed techniquesthat ultimately enabled my group to make the first experimental demonstration of non-equilibriumspin-polarized electron transport through silicon (2007). This was a hard technical and engineeringproblem to solve for many reasons; even now no other groups have replicated our success because ofthe enormous investment in time & capital, and the multi-disciplinary expertise required for success.A panoramic photo of several multi-chambered ultra-high vacuum thin-film deposition chambersthat were entirely custom-designed and built by me for this purpose are shown below inside mycustom semiconductor device fabrication cleanroom in Fig. 1, and my new low-temperature devicemeasurement lab is shown in Fig. 2.

Figure 1: Custom-built ultra-high vacuum thin-film deposition chambers in Appelbaums semicon-ductor device fabrication cleanroom in the Physical Sciences Complex, and an examplepackaged and mounted spintronic semiconductor device array fabricated using them.

1

Figure 2: Appelbaums semiconductor device measurement lab in the Physical Sciences Complex.

Carving out this niche in the field has led to many unique opportunities for exploring a previouslyobscured but rich scientific landscape. Since my transition to the Physics department at UMD in2009, I have exploited our prior technical accomplishments in device design and fabrication to focuson the more fundamental aspects such as the microscopic mechanisms dominating transport of spin-polarized electrons in elemental semiconductors, especially relaxation or spin flip. Over the courseof these last 6 years or so, we have had many successes in identifying these processes, especiallywhere the crystal symmetry, electronic states properties, and isoenergetic surface topology (andhence the nature of momentum scattering) play a major role.

2 Some context: Research style

My research described above is within the discipline of solid-state condensed-matter physics. Al-though this is a rather broad field, a small number of topics tend to dominate attention at any onetime, with trends shifting every few years. It is often sensible to align ones research to these trends,since it maintains a sense of scholarly community and is to some degree essential in a sociologicalcontext to establish scientific consensus.

My own approach to research has nevertheless always been to pursue topics where I can make aunique contribution to the field, regardless of trends. I am generally not interested in the obviousnext steps that others will do in droves applying the same set of tools to the same problems aseveryone else once a hot new subject attracts attention.

As an experimentalist, my lab builds arrays of complicated semiconductor devices from barecommodity wafers using unconventional techniques enabled by fabrication equipment I designedand custom-built. This work is very demanding and it takes new lab members many months tomake progress even just to reproduce known results obtained by previous students and postdocs.We subsequently perform all the low-temperature measurements on these fragile devices.

Although we have collaborated with theorists on a few occasions, I have a more holistic approachthan most experimentalists. I especially enjoy demonstrating the relevance of theory in numericalcomputer simulations to uncover the physical mechanisms responsible for the phenomena observedin our data. By doing essentially everything necessary ourselves, we strive to gain a completeunderstanding of our subject. Consequently, our papers have relatively few authors (I usually placemy name last in the authorship list), and I agonize over the choice of every sentence.

This research style applied to technically difficult topics both limits the production rate for journalpapers and makes our expertise difficult to acquire by other groups, resulting in an only modestcitation count (and so-called h-index). It also suppresses the kind of collateral authorship found inthe records of some researchers with many external collaborators where the intellectual contributionrequirements for inclusion are minimal. However, my goal is to maintain a creative, unique approachand exploit strengths distinct to my group and personal sense of scientific aesthetic. I maintain theconviction that numerically quantifiable citation impact cannot be the sole motivating factor fortruly long-lasting science.

3 Research Highlights

Below, I describe one significant paper from each year since joining UMD as associate professor in2009:

2009. Hyuk-Jae Jang and Ian Appelbaum, Spin Polarized Electron Transport near the Si/SiO2Interface, Phys. Rev. Lett. 103, 117202 (2009). [44 citations]:

As spin-polarized electrons are attracted to the oxide inter-face by an electrostatic gate, we observed a paradox: spin transittimes between injector and detector decreases and spin coher-ence as measured by Larmor precession fringes increases, de-spite a reduction in total spin polarization. We explained thisbehavior (which is in contrast with the expected exponential de-polarization seen in bulk transport devices) using a transformmethod to recover the empirical spin current transit-time distri-bution and a simple two-stage drift-diffusion model. We identi-fied strong interface-induced spin depolarization (reducing thespin lifetime by over 2 orders of magnitude from its bulk trans-port value) as the consistent cause of these phenomena, andresolved the paradox. This was followed up with extensive finite-differences modeling in Jing Li and Ian Appelbaum, Modelingspin transport in electrostatically-gated lateral-channel silicondevices: Role of interfacial spin relaxation, Phys. Rev. B 84,165318 (2011)[25 citations] and further experiments in Jing Liand Ian Appelbaum, Lateral spin transport through bulk sili-con, Appl. Phys. Lett. 100, 162408 (2012) [16 citations]. Through an international collaboration,we have begun to apply resonant microwave techniques to identify the microscopic mechanism forthis relaxation pathway, already showing that resonant microwave irradiation can be used to in-duce spin rotation of spin-polarized electrons as they travel across a silicon channel. [C. Lo, J. Li,I. Appelbaum, and J.J.L. Morton, Microwave manipulation of electrically injected spin polarizedelectrons in silicon, Phys. Rev. Applied 1, 014006 (2014).]

2010. Biqin Huang and Ian Appelbaum, The Larmor clock and anomalous spin dephasing in sili-

con, Phys. Rev. B Rapid Comm. 82, 241202(R) (2010). (Editors Suggestion) [24 citations]:Here we showed that measurement of coherent spin precession

in a controllable magnetic field can be transformed into an empiri-cal spin transit time distribution with sub-nanosecond resolution,without the need for time-of-flight methods. A spin analogue ofthe classic Haynes-Shockley experiment (for minority charge car-riers) is then possible. Analysis of these transport-time distribu-tions from long-distance silicon channels revealed a spin diffusioncoefficient inconsistent with the Einstein relation that relates dif-fusivity to mobility, as expected for non-conserved quantities likespin.

http://dx.doi.org/10.1103/PhysRevLett.103.117202


http://dx.doi.org/10.1103/PhysRevB.84.165318



http://dx.doi.org/10.1063/1.4704802

http://dx.doi.org/10.1063/1.4704802

http://dx.doi.org/10.1103/PhysRevApplied.1.014006

http://dx.doi.org/10.1103/PhysRevApplied.1.014006



2011. Yuan Lu, Jing Li, and Ian Appelbaum, Spin-Polarized Transient Electron Trapping inPhosphorus-doped Silicon, Phys. Rev. Lett. 106, 217202 (2011). [13 citations]:

Using the Larmor clock analysis described above to examine trans-port data from silicon with intentional donor impurities, we observedevidence for two distinct transport pathways: (i) short time scales(50 ps) due to purely conduction-band transport from injector todetector and (ii) long time scales (1 ns) originating from delays as-sociated with capture or reemission in shallow impurity traps. Theorigin of this phenomenon, examined via temperature, voltage, andelectron density dependence measurements, was established by meansof a comparison to a numerical model inspired by probabilistic queu-ing theory, and is shown to reveal the participation of metastableexcited states in the phosphorus-impurity spectrum. This work theninspired ongoing research (funded by ONR) into radiative emissionfrom impurity level transitions and the manipulation of spin selectionrules for controllable THz sources.

2012. Jing Li, Lan Qing, Hanan Dery, and Ian Appelbaum, Field-induced negative differential spinlifetime in silicon, Phys. Rev. Lett. 108, 157201 (2012). [27 citations]:

In this work detailing the analysis of spin-transport measure-ments in high electric fields, we showed that the electric-field-induced thermal asymmetry between the electron and lattice sys-tems in pure silicon substantially impacts the identity of the dom-inant spin relaxation mechanism. Comparison of empirical resultsfrom long-distance spin transport devices with detailed MonteCarlo simulations confirms a strong spin depolarization beyondwhat is expected from the standard Elliott-Yafet theory even atlow temperatures. The enhanced spin-flip mechanism is attributed

to phonon emission processes during which electrons are scattered between conduction band valleysthat reside on different crystal axes. This leads to anomalous behavior, where (beyond a criticalfield) reduction of the transit time between spin-injector and spin-detector is accompanied by acounterintuitive reduction in spin polarization and an apparently negative spin lifetime.

2013. Pengke Li, Jing Li, Lan Qing, Hanan Dery, and Ian Appelbaum, Anisotropy-driven spin

relaxation in germanium, Phys. Rev. Lett. 111, 257204 (2013). (Editors Suggestion)[13 ci-tations]:

We demonstrated an extraordinary mechanism in cen-trosymmetric diamond-lattice germanium which is remi-niscent of the Dyakonov-Perel spin relaxation process thatdominates in noncentrosymmetric semiconductor crystallattices. In that well-known case, broken spatial inver-sion symmetry allows spin-orbit interaction to cause amomentum-dependent spin splitting; intravalley scatteringduring spin precession about this random effective mag-netic field leads to depolarization. By straightforwardlyshowing the suppression of spin polarization with a longitu-dinal magnetic field in germanium spin-transport devices,





http://link.aps.org/doi/10.1103/PhysRevLett.111.257204

http://link.aps.org/doi/10.1103/PhysRevLett.111.257204

we identify an analogous spin relaxation pathway caused by the presence of an additional randomfield whose origin is rooted instead in the broken time reversal symmetry, and intervalley scatteringallows g-factor anisotropy to drive its fluctuation between four different orientations.

This is the first experimental result in the field that fully demonstrates the sensitivity of spintransport to band structure topology and symmetry through the spin-orbit interaction.

2014. P. Li and I. Appelbaum, Electrons and holes in phosphorene, Phys. Rev. B 90, 115439

(2014) (Editors Suggestion)[14 citations]:Despite its low atomic number and inversion symmetry, recent

electronic measurements demonstrate that (group-IV) graphenehas a greatly disappointing and temperature-insensitive spin life-time, corroborated by theory showing strong coupling to flexural(out-of-plane) phonons that cannot be effectively suppressed dueto quadratic dispersion and therefore an energy-indpendent densityof states. There exists a class of graphene-like 2-dimensional semi-conductors formed from elemental group-IV OR group V atoms,some of which may be immune to this deleterious coupling. Onlyone is known to mechanically exfoliate like graphene: phosphorene(monolayer black phosphorus). Using group theory, we analyzed

the symmetry of its electronic bandstructure including spin-orbit interaction close to the insulatinggap edge with special interest in the spin-transport properties. Importantly, we discovered that theunique anisotropy of the valence band vastly suppresses spin relaxation due to flexural phononsfor polarization along a specific in-plane direction. This result allowed us to predict a spin lifetimecomparable to bulk Si, vastly greater than graphene. I am actively in search of funding to extendthis theory work to the realm of experiment so that we can test this prediction.

2015. L. Qing, J. Li, I. Appelbaum, and H. Dery, Spin relaxation via exchange with donor impurity-bound electrons, Phys. Rev. B Rapid Comm. 91, 241405(R) (2015):

At low temperatures, electrons in semiconductors are boundto shallow donor impurity ions, neutralizing their charge inequilibrium. Inelastic scattering of other externally-injectedconduction electrons accelerated by electric fields can excitetransitions within the manifold of these localized states. Pro-motion of the bound electron into highly spin-orbit-mixed ex-cited states drives a strong spin relaxation of the conductionelectrons via dynamic exchange interactions, reminiscent ofthe Bir-Aronov-Pikus process where exchange occurs with va-lence band hole states. Through low-temperature experiments with silicon spin transport devicesand complementary theory incorporating a master rate-equation approach using Fermis goldenrule, we revealed the consequences of this previously unknown spin depolarization mechanism bothbelow and above the impact ionization threshold and into the deep inelastic regime.


http://link.aps.org/doi/10.1103/PhysRevB.91.241405

http://link.aps.org/doi/10.1103/PhysRevB.91.241405

4 Broader Interests

Majorana modes in 1D spin-orbit coupled superconductors: Dur-ing Spring 2013, I spent 3 days a week at Harvard under the gra-cious hospitality of Prof. Amir Yacoby as a Visiting Scholar,primarily on numerical modeling of spin-orbit-coupled supercon-ductor materials and detection schemes for observing the pre-dicted Majorana fermion in these systems. This resulted in twopapers, one describing a novel technique (Ian Appelbaum, Tun-nel conductance spectroscopy via harmonic generation in a hybridcapacitor device, Appl. Phys. Lett. 103, 122604 (2013) [11 cita-tions]), and a funded proposal (NSF-DMR unsolicited) to carryout its experimental realization using materials from epitaxial-growth collaborators at Adelphi Army Research Labs. The othermakes use of electrostatic detection of Majorana modes: G. Ben-Shach, A. Haim, I. Appelbaum, Y. Oreg, A. Yacoby and B.I.Halperin, Detecting Majoranas in 1D wires by charge sensing,Phys. Rev. B 91, 045403 (2015) [3 citations].

Topological Insulators: I developed a numerical model predict-ing a unique signature of dielectric insulator surface states onthe polarized resonant electromagnetic transmission spectrum,I. Appelbaum, Cross-Polarized Microwave Surface-State Anti-Resonance, J. Appl. Phys. 116, 064903 (2014). This work ispotentially relevant to the search for novel topological insula-tors, a presently active topic in the field with which I have sev-eral prior contributions: Ian Appelbaum, H.D. Drew, and M.S.Fuhrer, Proposal for a topological spin rectifier, Appl. Phys.Lett. 98, 023103 (2011) [23 citations] and C. Ojeda-Aristizabal,M. S. Fuhrer, N. P. Butch, J. Paglione, and Ian Appelbaum,Towards spin injection from silicon into topological insulators:Schottky barrier between Si and Bi2Se3, Appl. Phys. Lett. 101,023102 (2012) [10 citations].

http://dx.doi.org/10.1063/1.4821748

http://dx.doi.org/10.1063/1.4821748

http://dx.doi.org/10.1063/1.4821748

http://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.045403

http://dx.doi.org/10.1063/1.4892867

http://dx.doi.org/10.1063/1.4892867

http://dx.doi.org/10.1063/1.3541545

http://dx.doi.org/10.1063/1.4733388

http://dx.doi.org/10.1063/1.4733388

5 Current and Future directions

Several important topics in semiconductor spintronics supported in part by existing funded projects:

Recently, we have obtained initial results on THz emission from doped Si devices (see 2011paper above), motivating our present work on utilizing spectroscopically-isolated impurity-level transition lines to produce controllably circularly-polarized radiation resulting from thespin selection rules. This is a major standing problem in the field, relevant to e.g. chiralmolecule analysis.

Breaking discrete rotational symmetry with uniaxial strain: Spin relaxation in indirect-bandgapcentrosymmetric semiconductors is dominated by electron-phonon-mediated intervalley scat-tering. Lattice distortion caused by mechanical stress breaks the valley degeneracy and sup-presses this scattering, which should lead to massively enhanced spin lifetimes. Our tunneljunction injectors can easily withstand the necessary strain and we have developed the nec-essary device fabrication and built a low-temperature strain vise probe with custom contactgeometry.

Electron spin resonance: In addition to collaboration with Mortons lab as described above(see 2009 Highlight), we are also building our own low-temperature ESR system to explore res-onance identification of paramagnetic centers, and provide additional evidence of e.g. strain-induced spin lifetime enhancement in Si and Ge.

Inelastic electron tunneling spectroscopy: We have used this technique to identify extrinsiccontributions to a magnetoresistance phenomenon that has captured the attention of thespintronics community since it mimics spin detection: H. Tinkey, P. Li, and I. Appelbaum,Inelastic electron tunneling spectroscopy of local spin accumulation devices, Appl. Phys.Lett. 104, 232410 (2014) [9 citations]. I have also developed a rigorously self-consistent methodfor simulating true spin-accumulation magnetoresistance: I. Appelbaum, H. N. Tinkey, and P.Li, Self-consistent model of spin accumulation magnetoresistance in ferromagnet-insulator-semiconductor tunnel junctions, Phys. Rev. B 90, 220402(R) (2014).

Alternative spin detection schemes: Only two electrical spin detection methods have ever beendemonstrated for use with semiconductors. Both use a ferromagnetic metal contact, eitherin open-circuit voltage detection (as pioneered by Johnson and Silsbee, originally with Al in1985, and applied to GaAs by Crowells group in 2007) or in closed-circuit current detec-tion exploiting spin-dependent inelastic scattering (as developed and extensively used by mygroup). Each has its own disadvantages; the former is not applicable to nondegenerate semi-conductors, and the latter suffers from small signal levels. To enable a spin-polarized electronicinterconnect that circumvents technology constraints on metallic interconnects affecting pack-ing density (due to capacitive cross-talk) or modulation speed (due to RC time delay), wedeveloped a hybrid device design with benefits of both approaches, describing and modeling itin Bryan Hemingway and Ian Appelbaum, A Differential Spin Detection Scheme, J. Appl.Phys. 114, 093907 (2013). Ongoing fabrication and measurement to benchmark the proposedtechnique under current DTRA funding.

http://dx.doi.org/10.1063/1.4883638



http://dx.doi.org/10.1063/1.4820467

Scientific focus

Some context: Research style

Research Highlights

Broader Interests

Current and Future directions

http://maps.google.com/maps/ms?ie=UTF&msa=0&msid=205373386241137011999.000494c753d05031c4fe4mailto:[email protected]://appelbaumlab.umd.edu/CV.htmlhttp://dspace.mit.edu/handle/1721.1/29612

PEER-REVIEWED JOURNAL PAPERS [statistics][arXiv]

65. L. Qing, J. Li, I. Appelbaum, and H. Dery, Spin relaxation via exchange withdonor impurity-bound electrons, Phys. Rev. B Rapid Comm. 91, 241405(R) (2015).

64. G. Ben-Shach, A. Haim, I. Appelbaum, Y. Oreg, A. Yacoby and B.I. Halperin,Detecting Majorana modes in one-dimensional wires by charge sensing, Phys. Rev.B 91, 045403 (2015).

63. I. Appelbaum, H. N. Tinkey, and P. Li, Self-consistent model of spin accumulationmagnetoresistance in ferromagnet-insulator-semiconductor tunnel junctions, Phys.Rev. B 90, 220402(R) (2014).

62. P. Li and I. Appelbaum, Electrons and holes in phosphorene, Phys. Rev. B 90,

115439 (2014).

61. I. Appelbaum, Cross-Polarized Microwave Surface-State Anti-Resonance, J. Appl.Phys. 116, 064903 (2014).

60. H. Tinkey, P. Li, and I. Appelbaum, Inelastic electron tunneling spectroscopy oflocal spin accumulation devices, Appl. Phys. Lett. 104, 232410 (2014).

59. C. Lo, J. Li, I. Appelbaum, and J.J.L. Morton, Microwave manipulation of elec-trically injected spin polarized electrons in silicon, Phys. Rev. Applied 1, 014006(2014).

58. P. Li, J. Li, L. Qing, H. Dery, and I. Appelbaum, Anisotropy-driven spin relaxation

in germanium, Phys. Rev. Lett. 111, 257204 (2013).

57. I. Appelbaum, Tunnel conductance spectroscopy via harmonic generation in ahybrid capacitor device, Appl. Phys. Lett. 103, 122604 (2013).

56. B. Hemingway and I. Appelbaum, A Differential Spin Detection Scheme, J. Appl.Phys. 114, 093907 (2013).

55. J. Li and I. Appelbaum, Inelastic spin depolarization spectroscopy in silicon, J.Appl. Phys. 114, 033705 (2013).

54. C. Ojeda-Aristizabal, M. S. Fuhrer, N. P. Butch, J. Paglione, and I. Appelbaum,Towards spin injection from silicon into topological insulators: Schottky barrierbetween Si and Bi2Se3, Appl. Phys. Lett. 101, 023102 (2012).

53. J. Li and I. Appelbaum, Lateral spin transport through bulk silicon, Appl. Phys.Lett. 100, 162408 (2012).

52. J. Li, L. Qing, H. Dery, and I. Appelbaum, Field-induced negative differential spinlifetime in silicon, Phys. Rev. Lett. 108, 157201 (2012).

51. J. Li and I. Appelbaum, Modeling spin transport in electrostatically-gated lateral-channel silicon devices: Role of interfacial spin relaxation, Phys. Rev. B 84, 165318(2011).

50. I. Appelbaum, Introduction to Spin-Polarized Ballistic Hot Electron Injection andDetection in Silicon, Phil. Trans. R. Soc. A 369, 3554 (2011).

49. Y. Lu, J. Li, and I. Appelbaum, Spin-Polarized Transient Electron Trapping inPhosphorus-doped Silicon, Phys. Rev. Lett. 106, 217202 (2011).

http://scholar.google.com/citations?hl=en&user=1z6xR14AAAAJhttp://arxiv.org/find/cond-mat/1/au:+Appelbaum_I/0/1/0/all/0/1http://link.aps.org/doi/10.1103/PhysRevB.91.241405http://link.aps.org/doi/10.1103/PhysRevB.91.241405http://dx.doi.org/10.1103/PhysRevB.91.045403http://dx.doi.org/10.1103/PhysRevB.90.220402http://dx.doi.org/10.1103/PhysRevB.90.220402http://dx.doi.org/10.1103/PhysRevB.90.115439http://dx.doi.org/10.1063/1.4892867http://dx.doi.org/10.1063/1.4883638http://dx.doi.org/10.1063/1.4883638http://dx.doi.org/10.1103/PhysRevApplied.1.014006http://dx.doi.org/10.1103/PhysRevApplied.1.014006http://link.aps.org/doi/10.1103/PhysRevLett.111.257204http://link.aps.org/doi/10.1103/PhysRevLett.111.257204http://dx.doi.org/10.1063/1.4821748http://dx.doi.org/10.1063/1.4821748http://dx.doi.org/10.1063/1.4820467http://dx.doi.org/10.1063/1.4815873http://dx.doi.org/10.1063/1.4733388http://dx.doi.org/10.1063/1.4733388http://dx.doi.org/10.1063/1.4704802http://dx.doi.org/10.1103/PhysRevLett.108.157201http://dx.doi.org/10.1103/PhysRevLett.108.157201http://dx.doi.org/10.1103/PhysRevB.84.165318http://dx.doi.org/10.1103/PhysRevB.84.165318http://dx.doi.org/10.1098/rsta.2011.0137http://dx.doi.org/10.1098/rsta.2011.0137http://dx.doi.org/10.1103/PhysRevLett.106.217202http://dx.doi.org/10.1103/PhysRevLett.106.217202

48. I. Appelbaum, H.D. Drew, and M.S. Fuhrer, Proposal for a topological spinrectifier, Appl. Phys. Lett. 98, 023103 (2011).

47. B. Huang and I. Appelbaum, The Larmor clock and anomalous spin dephasing in

silicon, Phys. Rev. B Rapid Comm. 82, 241202(R) (2010).

46. Y. Lu and I. Appelbaum, Reverse Schottky-Asymmetry Spin Current Detectors,Appl. Phys. Lett. 97, 162501 (2010).

45. H.-J. Jang and I. Appelbaum, Magnetocurrent of ballistically injected electronsin insulating silicon, Appl. Phys. Lett. 97, 182108 (2010).

44. J. Garramone, J. Abel, I. Sitnitsky, L. Zhao, I. Appelbaum, and V. LaBella, Mea-surement of the hot electron attenuation length of copper, Appl. Phys. Lett. 96,062105 (2010).

43. I. Appelbaum, A Haynes-Shockley Experiment for Spin-Polarized Electron Trans-port in Silicon, Solid-State Electronics 53, 1242 (2009).

42. J. Li, and I. Appelbaum, Modeling spin transport with current-sensing spin detec-tors, Appl. Phys. Lett. 95, 152501 (2009).

41. H.-J. Jang, and I. Appelbaum, Spin Polarized Electron Transport near the Si/SiO2Interface, Phys. Rev. Lett. 103, 117202 (2009).

40. B.Q. Huang and I. Appelbaum, Heterointegrated near-field photodetector forballistic electron emission luminescence, J. Appl. Phys. 105, 086105 (2009).

39. R. Gupta, I. Appelbaum, and B.G. Willis, Reversible Molecular Adsorption andDetection Using Inelastic Electron Tunneling Spectroscopy in Monolithic NanoscopicTunnel junctions, J. Phys. Chem. C 113, 3874 (2009).

38. H.-J. Jang, J. Xu, J. Li, B.Q. Huang, and I. Appelbaum, Non-ohmic spin transportin n-type doped Silicon, Phys. Rev. B 78, 165329 (2008).

37. B.Q. Huang, H.-J. Jang, and I. Appelbaum, Geometric dephasing-limited Hanleeffect in long-distance lateral silicon spin transport devices, Appl. Phys. Lett. 93,162508 (2008).

36. L. Zhao, B. Huang, O. Olowolafe, and I. Appelbaum, BottomUp-FabricatedOxideMetalSemiconductor Spin-Valve Transistor, IEEE Elec. Device Lett. 29,892 (2008).

35. B.Q. Huang and I. Appelbaum, Spin Dephasing in Drift-Dominated SemiconductorSpintronics Devices, Phys. Rev. B 77, 165331 (2008).

34. J. Li, B.Q. Huang, and I. Appelbaum, Oblique Hanle Effect in SemiconductorSpintronic Devices, Appl. Phys. Lett. 92, 142507 (2008).

33. B.Q. Huang, D.J. Monsma, and I. Appelbaum, Coherent spin transport througha 350-micron-thick Silicon wafer, Phys. Rev. Lett. 99, 177209 (2007).

32. I. Appelbaum, B.Q. Huang, and D.J. Monsma, Electronic measurement and controlof spin transport in silicon, Nature 447, 295 (2007).

31. B.Q. Huang, D.J. Monsma, and I. Appelbaum, Experimental realization of asilicon spin field-effect transistor, Appl. Phys. Lett. 91, 072501 (2007).

http://dx.doi.org/10.1063/1.3541545http://dx.doi.org/10.1063/1.3541545http://dx.doi.org/10.1103/PhysRevB.82.241202http://dx.doi.org/10.1103/PhysRevB.82.241202http://dx.doi.org/10.1063/1.3504659http://dx.doi.org/10.1063/1.3511681http://dx.doi.org/10.1063/1.3511681http://dx.doi.org/10.1063/1.3299712http://dx.doi.org/10.1063/1.3299712http://dx.doi.org/10.1016/j.sse.2009.09.012http://dx.doi.org/10.1016/j.sse.2009.09.012http://dx.doi.org/10.1063/1.3241080http://dx.doi.org/10.1063/1.3241080http://dx.doi.org/10.1103/PhysRevLett.103.117202http://dx.doi.org/10.1103/PhysRevLett.103.117202http://dx.doi.org/10.1063/1.3116507http://dx.doi.org/10.1063/1.3116507http://dx.doi.org/10.1021/jp806074fhttp://dx.doi.org/10.1021/jp806074fhttp://dx.doi.org/10.1021/jp806074fhttp://dx.doi.org/10.1103/PhysRevB.78.165329http://dx.doi.org/10.1103/PhysRevB.78.165329http://dx.doi.org/10.1063/1.3006333http://dx.doi.org/10.1063/1.3006333http://dx.doi.org/10.1109/LED.2008.2001177http://dx.doi.org/10.1109/LED.2008.2001177http://dx.doi.org/10.1103/PhysRevB.77.165331http://dx.doi.org/10.1103/PhysRevB.77.165331http://dx.doi.org/10.1063/1.2907497http://dx.doi.org/10.1063/1.2907497http://dx.doi.org/10.1103/PhysRevLett.99.177209http://dx.doi.org/10.1103/PhysRevLett.99.177209http://dx.doi.org/10.1038/nature05803http://dx.doi.org/10.1038/nature05803http://dx.doi.org/10.1063/1.2770656http://dx.doi.org/10.1063/1.2770656

30. B.Q. Huang, L. Zhao, D.J. Monsma, and I. Appelbaum, 35% magnetocurrent withspin transport through Si, Appl. Phys. Lett. 91, 052501 (2007).

29. B.Q. Huang, D.J. Monsma, and I. Appelbaum, Spin lifetime in silicon in thepresence of parasitic electronic effects, J. Appl. Phys. 102, 013901 (2007).

28. I. Appelbaum and D.J. Monsma, Transit-Time Spin Field-Effect-Transistor, Appl.Phys. Lett. 90, 262501 (2007). Jun. 25, 2007 cover

27. L. Zhao, P. Thompson, N.N. Faleev, D.W. Prather, and I. Appelbaum, Two-Photon Passive Electro-Optic Up-Conversion in a GaAs/AlGaAs HeterostructureDevice, Appl. Phys. Lett. 90, 121132 (2007).

26. B.Q. Huang, I. Altfeder, and I. Appelbaum, Spin-Valve Photo-Transistor, Appl.Phys. Lett. 90, 052503 (2007). Jan. 29, 2007 cover

25. I. Altfeder, B.Q. Huang, I. Appelbaum, and B.C. Walker, Self-assembly of EpitaxialMonolayers for Vacuum Wafer Bonding, Appl. Phys. Lett. 89, 223127 (2006).

24. K.J. Russell, V. Narayanamurti, I. Appelbaum, M.P. Hanson, & A.C. Gossard,Hot-electron mean free path of ErAs thin films grown on GaAs determined bymetal-base transistor ballistic electron emission spectroscopy, Phys. Rev. B 74,205330 (2006).

23. M.R. Olson, K.J. Russell, V. Narayanamurti, J.M. Olson, and I. Appelbaum, Lin-ear photon upconversion of 400 meV in an AlGaInP/GaInP quantum well het-erostructure to visible light at room temperature, Appl. Phys. Lett. 88, 161108(2006).

22. B.Q. Huang and I. Appelbaum, Perpendicular Hot-Electron Transport in theSpin-Valve Photodiode, J. Appl. Phys. 100, 034501 (2006).

21. W. Yi, I. Appelbaum, K.J. Russell, V. Narayanamurti, R. Schalek, M.P. Hanson,and A.C. Gossard, Vertically integrated optics for BEEL: Device and microscopycharacterizations, J. Appl. Phys. 100, 013105 (2006).

20. I. Appelbaum, P. Thompson, and P.J.A. van Schendel, A modified Nanosurfscanning tunnelling microscope for ballistic electron emission microscopy andspectroscopy, Meas. Sci. Technol. 17, N13-N16 (2006).

19. W. Yi, I. I. Kaya, I. B. Altfeder, I. Appelbaum, D. M. Chen, and V. Narayana-murti, Dual-probe scanning tunneling microscope for study of nanoscale metal-semiconductor interfaces, Rev. Sci. Instrum. 76, 063711 (2005).

18. K.J. Russell, I. Appelbaum, V. Narayanamurti, M.P. Hanson, and A.C. Gossard,Transverse momentum Non-Conservation at the ErAs/GaAs interface, Phys. Rev.B Rapid 71, 121311(R) (2005).

17. I. Appelbaum and V. Narayanamurti, Monte Carlo calculations for metal-semi-conductor hot-electron injection via tunnel-junction emission, Phys. Rev. B 71,045320 (2005).

16. I. Appelbaum, W. Yi, K.J. Russell, V. Narayanamurti, M.P. Hanson, and A.C.Gossard, Vertically Integrated Optics for Ballistic Electron Emission LuminescenceMicroscopy, Appl. Phys. Lett. 86, 063110 (2005).

15. K.J. Russell, I. Appelbaum, W. Yi, F.C. Capasso, D.J. Monsma, C.M. Marcus, V.Narayanamurti, M.P. Hanson, and A.C. Gossard, Avalanche Spin-Valve Transis-tor, Appl. Phys. Lett. 85, 4502 (2004).

http://dx.doi.org/10.1063/1.2767198http://dx.doi.org/10.1063/1.2767198http://dx.doi.org/10.1063/1.2750411http://dx.doi.org/10.1063/1.2750411http://dx.doi.org/10.1063/1.2752015http://scitation.aip.org/apl/covers/90_26.jsphttp://dx.doi.org/10.1063/1.2716354http://dx.doi.org/10.1063/1.2716354http://dx.doi.org/10.1063/1.2716354http://dx.doi.org/10.1063/1.2436715http://scitation.aip.org/apl/covers/90_5.jsphttp://dx.doi.org/10.1063/1.2399358http://dx.doi.org/10.1063/1.2399358http://dx.doi.org/10.1103/PhysRevB.74.205330http://dx.doi.org/10.1103/PhysRevB.74.205330http://dx.doi.org/10.1063/1.2195094http://dx.doi.org/10.1063/1.2195094http://dx.doi.org/10.1063/1.2195094http://dx.doi.org/10.1063/1.2220643http://dx.doi.org/10.1063/1.2220643http://dx.doi.org/10.1063/1.2208738http://dx.doi.org/10.1063/1.2208738http://dx.doi.org/10.1088/0957-0233/17/4/N02http://dx.doi.org/10.1088/0957-0233/17/4/N02http://dx.doi.org/10.1088/0957-0233/17/4/N02http://dx.doi.org/10.1063/1.1938969http://dx.doi.org/10.1063/1.1938969http://dx.doi.org/10.1103/PhysRevB.71.121311http://dx.doi.org/10.1103/PhysRevB.71.045320http://dx.doi.org/10.1103/PhysRevB.71.045320http://dx.doi.org/10.1063/1.1861961http://dx.doi.org/10.1063/1.1861961http://dx.doi.org/10.1063/1.1818339http://dx.doi.org/10.1063/1.1818339

14. I. Appelbaum, K.J. Russell, I. Shalish, V. Narayanamurti, M.P. Hanson, and A.C.Gossard, Ballistic Hole Emission Luminescence, Appl. Phys. Lett. 85, 2265 (2004).

13. Wei Yi, I. Appelbaum, K.J. Russell, V. Narayanamurti, M.P. Hanson, and A.C.Gossard, Ballistic Electron Emission Luminescence of an InAs Quantum DotHeterostructure, Appl. Phys. Lett. 85, 1990 (2004).

12. I. Appelbaum, T. Wang, J.D. Joannopoulos, & V. Narayanamurti, Ballistic HotElectron Transport in Nanoscale Semiconductor Heterostructures: Exact Self-Energyof a 3-D Periodic Tight Binding Hamiltonian, Phys. Rev. B 69, 165301 (2004).

11. I. Appelbaum, K.J. Russell, M. Kozhevnikov, V. Narayanamurti, M.P. Hanson, andA.C. Gossard, Room-Temp. Ballistic Electron Emission Luminescence Spectroscopywith a Scanning Tunneling Microscope, Appl. Phys. Lett. 84, 547 (2004).

10. I. Appelbaum, K.J. Russell, D.J. Monsma, V. Narayanamurti, C.M. Marcus, M.P.Hanson, and A.C. Gossard, Luminescent Spin-Valve Transistor, Appl. Phys. Lett.83, 4571 (2003).

9. I. Appelbaum, D.J. Monsma, K.J. Russell, V. Narayanamurti, and C.M. Marcus,Spin-Valve Photo-Diode, Appl. Phys. Lett. 83, 3737 (2003). Nov. 3, 2003 cover

8. I. Appelbaum, K.J. Russell, V. Narayanamurti, D.J. Monsma, C.M. Marcus, M.P.Hanson, A.C. Gossard, H. Temkin, and C.H. Perry, Ballistic Electron EmissionLuminescence, Appl. Phys. Lett. 82, 4498 (2003).

7. K.J. Russell, I. Appelbaum, H. Temkin, C.H. Perry, V. Narayanamurti, M.P. Han-son, and A.C. Gossard, Room-Temperature Electro-Optic Up-Conversion viaInternal Photo-Emission, Appl. Phys. Lett. 82, 2960 (2003).

6. I. Appelbaum, R. Sheth, I. Shalish, K.J. Russell, and V. Narayanamurti, Ex-perimental test of the planar tunneling model for Ballistic Electron EmissionSpectroscopy, Phys. Rev. B 67, 155307 (2003).

5. I. Appelbaum, J.D. Joannopoulos, V. Narayanamurti, Alternative paradigm forphysical computing, Phys. Rev. E 66, 66612 (2002).

4. R. Martinez, I. Appelbaum, C. V. Reddy, R. Sheth, K. J. Russell, V. Narayanamurti,J.-H. Ryou, U. Chowdhury, and R. D. Dupuis, Electron transport through stronglycoupled AlInP/GaInP superlattices, Appl. Phys. Lett. 81, 3576 (2002).

3. I. Appelbaum, T. Wang, S. Fan, J.D. Joannopoulos, and V. Narayanamurti, Cansilicon dimers form logic gates?, Nanotechnology 12, 391 (2001).

2. S. Fan, I. Appelbaum, and J.D. Joannopoulos, Near-Field Scanning Optical Mi-croscopy as a simultaneous probe of photonic crystals: a computational study,Appl. Phys. Lett. 75, 3461 (1999).

1. P.G. Kwiat, E. Waks, A.G. White, I. Appelbaum, and P.H. Eberhard, Ultrabrightsource of polarization-entangled photons, Phys. Rev. A 60, R773 (1999).

BOOK CHAPTER

I. Appelbaum, Spin-Polarized Ballistic Hot-Electron Injection and Detection inHybrid Metal Semiconductor Devices, Handbook of Spin Transport and Magnetism(CRC Press, 2011), E.Y. Tsymbal & I. Zutic, eds.

http://dx.doi.org/10.1063/1.1793347http://dx.doi.org/10.1063/1.1790595http://dx.doi.org/10.1063/1.1790595http://dx.doi.org/10.1103/PhysRevB.69.165301http://dx.doi.org/10.1103/PhysRevB.69.165301http://dx.doi.org/10.1103/PhysRevB.69.165301http://dx.doi.org/10.1063/1.1644329http://dx.doi.org/10.1063/1.1644329http://link.aip.org/link/doi/10.1063/1.1630838http://dx.doi.org/10.1063/1.1623315http://scitation.aip.org/apl/covers/83_18.jsphttp://dx.doi.org/10.1063/1.1584524http://dx.doi.org/10.1063/1.1584524http://link.aip.org/link/doi/10.1063/1.1571981http://link.aip.org/link/doi/10.1063/1.1571981http://dx.doi.org/10.1103/PhysRevB.67.155307http://dx.doi.org/10.1103/PhysRevB.67.155307http://dx.doi.org/10.1103/PhysRevB.67.155307http://dx.doi.org/10.1103/PhysRevE.66.066612http://dx.doi.org/10.1103/PhysRevE.66.066612http://dx.doi.org/10.1063/1.1519350http://dx.doi.org/10.1063/1.1519350http://dx.doi.org/10.1088/0957-4484/12/3/330http://dx.doi.org/10.1088/0957-4484/12/3/330http://dx.doi.org/10.1063/1.125296http://dx.doi.org/10.1063/1.125296http://dx.doi.org/10.1103/PhysRevA.60.R773http://dx.doi.org/10.1103/PhysRevA.60.R773http://www.crcpress.com/product/isbn/9781439803776http://www.crcpress.com/product/isbn/9781439803776

FEDERAL FUNDING [$4M/10yr] National Science Foundation (NSF), Harmonic detection of the Majorana fermion

in narrow bandgap InAsSb, $120,000 (PI, 6/14 - 5/15).

Office of Naval Research (ONR), Spin-polarized electron transport in intrinsic andextrinsic group-IV semiconductors, $363,726 (PI, 05/14 - 4/17).

NSF, Scalable Digital Spin Logic Devices, $360,000 (PI, 10/2012 - 9/15).

Defense Threat Reduction Agency/ U. Michigan, Spin-Polarized Silicon Photonicand Electronic Interconnects, $650,000 (co-PI, 11/12 - 10/17).

ONR, Spins in Silicon: Reduced Dimensions and Novel Material Applications,$261,472 (PI, 02/11 - 12/13).

ONR, Future Spintronics for Todays Electronics, $484,370 (PI, 6/08 - 5/11).

NSF, CAREER: Silicon Spintronics, $400,000 (PI, 6/08 - 5/14).

ONR, Elements of Silicon-based Spintronic Circuits, $248,652 (PI, 10/07 - 9/10).

DARPA, Silicon Spintronics for Quantum Computation, $230,000 (PI, 7/07 -1/09).

Department of Energy, Imaging of Buried Nanoscale Luminescent Layers, $478,433(PI, 8/07 - 7/10).

ONR, All-Electrical Spin Detection in III-V Semiconductors, $149,557 (PI, 1/06- 12/06).

DARPA, Electron Spin Detection for Silicon Spintronics, $100,000 (PI, 5/06 -4/07).

NSF, Tunneling Spectroscopy for Nanofabricated Biochemical Sensors, $240,001(co-PI, 6/06 - 5/09).

INVITED TALKS AT INTERNATIONAL CONFERENCES

36. APS Mid Atlantic Section Meeting, Morgantown, WV, 9/15

35. MMM-2014, Honolulu, 11/14 (by postdoc Pengke Li)

34. 2014 Joint International 226th Electrochemical Society, Cancun, 10/14 (declined)

33. APS March Meeting, Denver, 3/6/14 (by postdoc Pengke Li)

32. American Physical Society March Meeting Spintronics Tutorial, Denver, 3/2/14

31. Fund. & Applications of Semiconductor Spin Engineering, Osaka, 12/13 (declined)

30. Spintronics V Symposium of the SPIE, San Diego, 8/12/12 (declined)

29. CMOS Emerging Technologies Conference, Vancouver, 7/18/12 (declined)

28. 38th Special Session for Spintronics, Magnetics Society of Japan, Osaka, 1/20/12

27. American Physical Society March Meeting, Dallas, 3/21/11

26. 6th Intl Conf. on Physics and Applications of Spin-Related Phenomena in Semi-conductors, Tokyo, 8/1/10

http://www.nsf.gov/awardsearch/showAward?AWD_ID=1408796http://www.nsf.gov/awardsearch/showAward?AWD_ID=1408796http://www.nsf.gov/awardsearch/showAward?AWD_ID=1231855http://www.nsf.gov/awardsearch/showAward?AWD_ID=0901941http://www.dtic.mil/dtic/tr/fulltext/u2/a533911.pdfhttp://www.osti.gov/scitech/biblio/1067346http://www.dtic.mil/dtic/tr/fulltext/u2/a462737.pdfhttp://www.nsf.gov/awardsearch/showAward?AWD_ID=0601269

25. 30th Intl Conference on the Physics of Semiconductors, Seoul, 7/26/10

24. Intl Conf. on Core Res. and Eng. Science of Adv. Mat., Osaka, 5/30-6/4/10

23. Intl Conference on Solid State Devices and Materials, Sendai, 10/9/09

22. IMR Workshop on Group IV Spintronics, Tohoku U., Sendai, 10/5/09

21. ATI Spintronics Discussion Meeting, Tokyo, Japan, 10/3/09

20. The Spin on Electronics Discussion Meeting, Royal Society, London, 9/28/09

19. SPIE Optics+Photonics 2009, San Diego, 08/2/09

18. Jaszowiec 2009, Krynica, Poland, 6/26/09

17. Spin-Up 2009, Longyearbyen, Svalbard Norway, 5/31/09

16. New Frontiers in Spintronics, Institute for Advanced Studies, Jerusalem, 5/12/09

15. Spin Currents 2009, Stanford Sierra Conf. Center, 4/18/09

14. Materials Research Society Spring Meeting, San Francisco, 4/15/09

13. 10th Intl Conference on Ultimate Integration of Silicon, Aachen, 3/18/09

12. NTT Intl Symposium on Nanoscale Transport and Technology, Atsugi, 1/23/09

11. 4th International Nano-Science Symposium, Osaka, 9/29-10/1/08

10. 4th Spin Phenomena in Reduced Dimensions, Regensburg, 9/24-9/27/08

9. Joint European Magnetics Symposia, Dublin, 9/18/08

8. Gordon Research Conference on Magnetic Nanostructures, Grenoble, 9/4/08

7. 29th Intl Conference on the Physics of Semiconductors, Rio de Janiero, 7/28/08

6. NanoElectronics 2008, RWTH Aachen, 5/15/08

5. American Physical Society March Meeting, New Orleans, 3/12/08

4. 2nd ATI/IFCAM Intl Workshop on Spin Currents, Tohoku U., 2/19/08

3. Materials Research Society Fall Meeting, Boston, 11/26/07

2. Magnetism and Magnetic Materials Conference, Tampa, 11/8/07

1. Kavli Frontiers in Science Symposium (US NAS and Chinese IoP), Beijing, 10/29/07

SEMINARS AND COLLOQUIA

51. University of Maryland, Physics colloquium, 4/21/15

50. Purdue University, Condensed Matter seminar, 2/13/15

49. U. Maryland, Condensed Matter seminar, 2/5/15

48. Rutgers University, Laboratory for Surface Modification seminar, 2/20/14

47. U. Pittsburgh, Condensed Matter seminar, 10/18/13

46. Carnegie-Mellon University, Physics Colloquium, 10/17/13

http://rsta.royalsocietypublishing.org/content/369/1951/3553.short?rss=1http://www.sanken.osaka-u.ac.jp/for_TV/nanosympo2008/video/3-day/9_Appelbaum.asxhttp://vimeo.com/32338065



43. U. Delaware, ECE Devices and Materials seminar, 4/12/13

42. Adelphi Army Research Lab, seminar, 10/24/12

41. Johns Hopkins Applied Physics Lab, seminar, 5/3/12

40. Keio University, Tokyo, seminar, 1/13/12

39. U. Utah, Physics colloquium, 11/17/11

38. NIST/UMD Joint Quantum Institute, seminar, 3/7/11

37. NSA/UMD Laboratory for Physical Sciences, seminar, 3/2/11

36. U. Rochester, ECE seminar, 2/2/11

35. SUNY Buffalo, Physics, Condensed Matter seminar 2/1/11

34. Johns Hopkins, Physics, Condensed Matter seminar 10/20/10

33. Penn State, Physics, Condensed Matter seminar 10/18/10

32. West Virginia University, Physics colloquium, 9/24/10

31. National Institute of Materials Science, Tsukuba Japan, seminar, 6/4/10

30. Osaka University, seminar, 6/1/10

29. NIST Gaithersburg, seminar, 4/20/10

28. Ohio State University, Condensed Matter seminar, 3/3/10

27. New York University, Condensed Matter seminar, 11/13/09

26. Weizmann Institute, Rehovot Israel, Physics seminar 5/4/09

25. University of Maryland, College Park, Electrical Engineering seminar, 2/27/09

24. Case Western Reserve University, Condensed Matter seminar, 11/3/08

23. UCLA, Electrical Engineering seminar, 4/14/08

22. Purdue University, Electrical Engineering seminar, 4/11/08

21. University of Pennsylvania, Electrical Engineering seminar, 4/2/08

20. Northeastern University, Physics & ECE joint seminar, 3/20/08

19. NIST, Gaithersburg, seminar, 3/4/08

18. Brown University, Engineering seminar, 2/14/08

17. University of Maryland, Physics seminar, 2/7/08

16. IBM T.J. Watson Research Center, Physical Sciences Seminar, 2/1/08

15. Purdue University, Electrical Engineering seminar, 1/24/08

14. University of Pittsburgh, Physics colloquium, 1/7/08

http://www.youtube.com/watch?v=m2FqCScR2gohttp://vimeo.com/29163750

13. 115th Lectureship of the Zhong-Guan-Cun Forum on Condensed Matter Physics,Chinese Academy of Sciences Institute of Physics, Beijing, 11/2/07

12. Nanjing University, Physics colloquium, 11/1/07

11. Fudan University, Physics colloquium, 10/31/07

10. SUNY Albany, Nanoscale Science and Engineering colloquium, 10/19/07

9. SUNY Buffalo, Physics colloquium, 10/4/07

8. University of Delaware, Physics and Astronomy seminar, 2/27/07

7. University of Delaware, Electrical and Computer Engineering seminar, 9/27/04

6. University of Delaware, Physics and Astronomy seminar, 9/21/04

5. Virginia Tech, Physics seminar, 2/28/04

4. Lehigh University, Physics colloquium, 2/23/04

3. Drexel University, Physics colloquium, 2/9/04

2. University of Delaware, Electrical and Computer Engineering colloquium, 1/20/04

1. Rensselaer Polytechnic Institute, Physics colloquium, 9/24/03

THESES SUPERVISED

1. Hyun-Soo Kim MS 12/13 Hot Electron Injection into Uniaxially Strained SiliconUMD

2. Jing Li PhD 1/12 Extrinsic Spin Relaxation in Silicon Spin Transport Devicespostdoc at UMN

3. Jing Li MS 8/09 Oblique Hanle Effect in Silicon Spintronic Devices

4. Biqin Huang PhD 1/08 Vertical Transport Silicon Spintronic Devices HRL

5. Biqin Huang MS 6/07 Optical Spin Valve Effects

6. Lai Zhao MS 8/08 Integrated ballistic electron emission luminescence AppliedMaterials

7. Jing Xu MS 8/08 Modeling and simulation of spin transport and precession insilicon Microsoft

Other (non-thesis) MS completion: Gardner Swan 12 (USPTO) and Holly Tinkey14 (UMD)

SYNERGISTIC ACTIVITIES

Proposal reviewer: NSF (ECCS panel 9/08, 1/10, 5/11, 11/12), Research Corpo-ration, DOE, EPSCoR, Defense Threat Reduction Agency, Science FoundationIreland, Icelandic Centre for Research, Israel Science Foundation, Austrian ScienceFund

Referee: Nature Physics, Nature Nanotech, Nature Materials, Physical ReviewLetters, Physical Review B, Applied Physics Letters, Europhysics Letters, Journalof Applied Physics, J. Magn. Magn. Mat., Semiconductor Sci. and Tech., etc.

http://www.linkedin.com/pub/hyun-soo-kim/48/28/191http://drum.lib.umd.edu/handle/1903/15485https://www.linkedin.com/pub/jing-li/3b/34/945http://phdtree.org/pdf/25957408-extrinsic-spin-relaxation-in-silicon-spin-transport-devices/https://www.linkedin.com/pub/jing-li/3b/34/945http://gradworks.umi.com/14/69/1469530.htmlhttp://www.linkedin.com/pub/biqin-huang/a/21/1a4http://gradworks.umi.com/32/96/3296631.htmlhttp://www.linkedin.com/pub/biqin-huang/a/21/1a4http://gradworks.umi.com/14/44/1444640.htmlhttp://www.linkedin.com/pub/dir/Lai/Zhaohttp://gradworks.umi.com/14/57/1457436.htmlhttps://www.linkedin.com/in/jingxu1http://gradworks.umi.com/14/57/1457437.htmlhttp://gradworks.umi.com/14/57/1457437.html

Proposed and chaired 2015 APS March meeting invited symposium session, SpinAccumulation: Experiment and Theory Behind the Controversy.

Tutorial Instructor and session chair: Spintronics, APS March meeting (2014),Spin Transport Physics short course, DRC (2010).

Program Committee: 12th Joint MMM/Intermag (2013), PASPS-7 (EindhovenAugust 5-8 2012), 2010 and 2011 Electronic Materials Conference, Device ResearchConference (2009, 2010 and 2011), Focus Session on Spin Dependent Phenomenain Semiconductors, APS March meeting (2009), Chinese-American Kavli Frontiersin Science Symposium, US National Academy of Sciences (2008)

Five lectures viewed by over 3000 students worldwide on coursera.org MOOCExploring Quantum Physics

U.S. Patent 7244997, Magneto-Luminescent Transducer

Life Member 61024031, American Physical Society

AWARDS

2011 A.M. Haig prize / Outstanding Young Scientist, MD Academy of Sciences

2010 : IUPAP Young Scientist Prize in Semiconductor Physics

2009 NSF CAREER award

2008 Outstanding Junior Faculty Member for the College of Engineering (Delaware)

2007 Cambridge NanoTech Research Award

1998 G. Howard Carragan Award (RPI) For outstanding scholarship

1998 Hertz Foundation - Grant recipient

1996 Rensselaer Founders Award

MAJOR DEPARTMENTAL COMMITTEES CHAIRED

CME faculty search committee, 2013 (hired V. Manucharyan and J. Williams)

Undergraduate curriculum review committee, 2011 (authored 50+ page report)

http://meeting.aps.org/Meeting/MAR15/Session/Y20http://meeting.aps.org/Meeting/MAR15/Session/Y20http://appelbaum.physics.umd.edu/docs/ppt/Appelbaum_102414.pdfhttps://www.coursera.org/course/eqphttp://www.google.com/patents/US7244997http://www.mdsci.org/programs/outstanding-young-scientist-outstanding-young-engineer/past-oys-recipients/

TEACHING

:

Spring 15: PHYS402 Quantum Physics IIvery insightful and clear.Good use of matlab code and visuals to cause under-standing. Excellent professor I really enjoyed the use of electronic notes duringlecture and feel like I learned a lot during the course. His ability to clearly describethe topics, often taking a different approach than the book, was nice as it gave ustwo different perspectives on the same problems.Professor Appelbaum has beeninstrumental in helping me to wrap my head around the most difficult branch ofphysics.

Fall 14: PHYS165 Intro to Programming for the Physical SciencesProfessor Appelbaum was an excellent teacher who really knows his stuff. Hes agreat presenter of material and always emphasized that we learn. . . I enjoyed thecourse.

Spring 14: PHYS402 Quantum Physics IIGreat course, I learned a lot. Very good instruction style that introduced us tophysics in the real worldLove the teaching style. Very accommodating and easyto follow.. . . always answered questions helpfully and patiently . . . He did anamazing job teaching us the mathematical underpinnings of QM.. . . comes upwith different possible ways to teach and make us understand the lecture. Thankyou for that.

Fall 13: PHYS731 Solid State PhysicsI learned a lot from the course and feel it gave a great survey of a vast andinteresting field of physics Computing projects were fun The lectures were verywell organized (I especially liked that the PDF notes were available online) andwell thought out. Overall this was a great course instructor was always preparedfor lecture and explained the material in a knowledgeable fashion The teachingwas clear and concise.

Fall 12: PHYS731 Solid State PhysicsIan is the most organized, effective teacher I have had in graduate school. Becauseof his preparedness and ability to explain physical concepts clearly, we were able tocover a lot of material. This course was an elective for me, and I was pleasantlysurprised at how much I learned, how much I enjoyed learning it, and how easy itwas to learn it. Ians technology-driven teaching style is innovative and kept meengaged. Finally, the problem sets were illustrative and pitched at a level I felt wasreasonable, yet challenging. Again, this course was incredible and Id recommend itto any graduate student who is even mildly interested. This class was wonderfullydesigned and taught. This was a fantastic course that I think really did a goodjob of covering a wide range of topics at an appropriate level of depth.

Spring 12: PHYS401 Quantum Physics II found this course extremely enjoyable. It reminded me of why I decided tobecome a Physics major. Professor Appelbaum was very knowledgeable and appliedmathematical formalisms that were originally unfamiliar but ultimately extremelyhelpful. Professor was very coherent and very methodical. He taught the materialvery well and cared greatly about the students.

Fall 11: PHYS731 Solid State PhysicsI enjoyed the course immensely. Good lectures, difficult but rewarding homework.Overall, a class I enjoyed and was worth taking.

June 19, 2015

Teaching

Ian Appelbaum

My teaching record spans over 10 years. Since appointment as associate professor at U. Marylandin 2009, I have taught one lab course and several lecture-based courses (mostly at 400 and 700 level).In this Teaching Portfolio, I provide a discussion of my teaching goals, methods, and outcomes,with evidence gleaned from these recent teaching experiences.

1 Strengthening communication

Before beginning a new course, I always consult with my colleagues who have previously taught itfor guidance. I try to incorporate what I learn from them into my own teaching strategy, especiallywhen their ideas are intended to enhance the instructor-student dialogue. One of the most successfulexamples of this was a suggestion to construct course websites with piazza.com (developed by aformer UMD grad student); among many valuable resources, its asynchronous Q&A bulletin boardhas allowed my students to learn from each others questions, and contribute directly to their peerslearning experience by proposing answers themselves, as well.

2 Setting standards

Establishing an appropriate degree of difficulty in a physics course, especially in the first semesterteaching it, is often nontrivial. On the one hand, the material should be matched to student expec-tations and abilities based on their experiences with previous classes. On the other, the instructorhas a practical responsibility to insist that essential fundamental concepts are thoroughly under-stood (especially when they are prerequisite to more advanced classes). Furthermore, the instructorhas an intellectual responsibility to the students and him/herself to avoid simply rote adherence tothe textbook and its authors sole perspective and voice on the subject.

I have always sought to set the difficulty of my courses fairly high. Ideally, all the students shouldfeel challenged: that they learned a great amount but perhaps not every topic covered, and that thecourse as a whole was very near but not beyond the threshold of being too hard. This choicehas been largely successful, with many course evaluation comments conveying an appreciation forthe rigorous approach (see Section 5 on student comment highlights below).

However, there is a risk in doing this: one might initially set the standards too high, and onlylearn too late to make substantial changes that the students are not able to rise up to the standardsset. This occurred when I volunteered to teach PHYS165, Introduction to Programming for thePhysical Sciences in Fall 2014 (this class covers the basic elements of computer programming usingMATLAB and applies it to simple physics problems from elementary Newtonian mechanics). Incontrast to my previous experiences with several different courses, where I was able to use studentreactions to help calibrate the level as the the course went on, in this class such feedback fromthe students was weak and the class ended up at a level which was apparently beyond what thestudents could handle. At the end of the semester, I was therefore pleased to find one studentsevaluation comment including the quote below:

1

Professor Appelbaum was an excellent teacher who really knows his stuff. Hes agreat presenter of material and always emphasized that we learn. . . I enjoyed the course.

However, comments from some other students were unfortunately not as positive, and in starkcontrast to the rest of my altogether-satisfying teaching record, numerical scores for this class wereparticularly disappointing. Future semesters will clearly require more active engagement and arecalibration of difficulty level. I am eager to rise to the challenge of turning this particular course now required for Physics majors into a success (see Section 4 on incorporation of computer-aidednumerical methods, Subject matter below).

I enjoy lecturing immensely because in addition to the standard elements of logical argumentand detailed mathematical calculations it allows extemporaneous exposition and a bit of theater.This spontaneity creates a dynamic environment to convey not only the bare physics, but alsogives me an opportunity to inspire my students with enthusiasm and excitement for the subject.To further success toward ultimate learning outcomes, I have applied several innovations thatcomplement my personal style and enhance valuable interaction with the students, as detailed inthe next two sections:

3 Lecture materials

I do not use the white-/chalk-board on the walls, but rathera Tablet PC with projector. This is allows me to 1. writethe notes facing the students so that they hear my voiceloud and clear, and so I can see raised hands for questions,2. view each page in its entirety, exactly as the studentssee it, to keep the visuals organized and logical, 3. makeadjustments to text and figures beyond simple erasure suchas resizing, color, reshaping, copy & paste, etc, 4. save thenotes for distribution to the students as PDF files on thecourse website after any adjustments, corrections, additions, etc. are made following class, and 5.quickly review the previous lectures notes in the beginning of each class to remind the studentswhat they learned, its relevance to the present topic, and to give them the opportunity to asklingering questions in an ad hoc discussion.

The students respond quite positively to this teaching modality and the comments entered instudent evaluations reflect their appreciation. For example:

. . . very refreshing to be able to spend less time copying notes and more time absorbingthe professors unique perspective on the topic.

. . . technology-driven teaching style is innovative and kept me engaged.

. . . I really enjoyed the use of electronic notes during lecture and feel like I learned alot during the course.

. . . The lectures were very well organized (I especially liked that the PDF notes wereavailable online) and well thought out.

. . . This professor is by far one of the best lecturers Ive had at this university . . . Heis very well organized (something Ive never seen in the phys. department), and has awell-designed website with easily accessible notes/assignments.

At the end of the semester, I collate these notes and related materials. Several have been madeavailable to others online as self-published books: Quantum Physics (from PHYS401 and 402, ISBN9781312303119) and Solid State Physics (from PHYS731, ISBN 9781304791009).

4 Subject matter

Another aspect of my teaching style is an emphasis on incorporating numerical analysis with com-puter environments such as MATLAB to complement the usual analytic approach to solving prob-lems, commonly adhered to in textbooks.

After comparing the calculations to the conventionaltextbook result, we then often are able to explore similarphysical problems that elude simple analytical methods.Furthermore, I have found it very effective to includetasks asking the students to reproduce the numerical re-sults themselves on their PCs for homework. Althoughthey are sometimes initially unfamiliar and uncomfort-able with this kind of assignment, it ultimately has hadan overwhelmingly positive reaction from students as ev-idenced by course evaluation comments:

. . . I also appreciated the focus on numerical analysis, which allows one to gain a muchstronger intuition about the subject than only working on the few examples that can besolved analytically. Overall it felt like I gained an excellent understanding of the basicsof quantum mechanics, as well as a number of universal mathematical and analyticalskills.

Good use of matlab code and visuals to cause understanding. Excellent professor.

Computing projects were fun

I feel very strongly that in addition to aiding the learning process, an ability to translate scientificconcepts into relevant mathematics and instruction in an objective computer language (interpretthe resulting data) is an essential part of training in any STEM field that should be required aspart of an undergraduate degree in this 21st century. Making use of computers can and should bedone in the teaching laboratory setting as well: After teaching PHYS375 Experimental Physics III(Optics) in Fall 2009, I undertook a complete redesign of experiments to use MATLAB for dataacquisition in addition to replacement of optical hardware, manual rewrites, etc. In fact, I havehad former students tell me long after the course was finished that their experience learninghow to employ the computer to do numerical modeling using theory or automate experimentalmeasurements subsequently led to getting a job requiring that skill, or helped them decide whatcareer path to pursue.

Partly for this reason, I was pleased that the new Physics curriculum recommended by thedepartmental committee I co-chaired in 2011 now requires students to take either a 100- or 400-levelcourse on numerical methods in physics. The lower-level course I taught in Fall 2014, PHYS165Introduction to Programming for the Physical Sciences, will then attract a different studentprofile, leading to a more positive outcome.

http://appelbaum.physics.umd.edu/docs/notes/QuantumNotes.pdf

http://www.lulu.com/content/paperback-book/quantum-physics/14892135

http://www.lulu.com/content/paperback-book/quantum-physics/14892135

http://appelbaum.physics.umd.edu/docs/notes/PHYS731notes.pdf

http://www.lulu.com/content/paperback-book/solid-state-physics/14362122

5 Student evaluation comment highlights

@ U. Maryland, Physics Dept.:

Spring 15: PHYS402 Quantum Physics IIvery insightful and clear. Good use of matlab code and visuals to cause understanding.Excellent professor I really enjoyed the use of electronic notes during lecture and feel likeI learned a lot during the course. His ability to clearly describe the topics, often taking adifferent approach than the book, was nice as it gave us two different perspectives on thesame problems. Professor Appelbaum has been instrumental in helping me to wrap myhead around the most difficult branch of physics.

Fall 14: PHYS165 Intro to Programming for the Physical SciencesProfessor Appelbaum was an excellent teacher who really knows his stuff. Hes a greatpresenter of material and always emphasized that we learn. . . I enjoyed the course.

Spring 14: PHYS402 Quantum Physics IIGreat course, I learned a lot. Very good instruction style that introduced us to physics inthe real world Love the teaching style. Very accommodating and easy to follow.. . . alwaysanswered questions helpfully and patiently . . . He did an amazing job teaching us themathematical underpinnings of QM. . . . comes up with different possible ways to teach andmake us understand the lecture. Thank you for that.

Fall 13: PHYS731 Solid State PhysicsI learned a lot from the course and feel it gave a great survey of a vast and interestingfield of physics Computing projects were fun The lectures were very well organized (Iespecially liked that the PDF notes were available online) and well thought out. Overall thiswas a great course instructor was always prepared for lecture and explained the materialin a knowledgeable fashion The teaching was clear and concise.

Fall 12: PHYS731 Solid State PhysicsIan is the most organized, effective teacher I have had in graduate school. Because of hispreparedness and ability to explain physical concepts clearly, we were able to cover a lot ofmaterial. This course was an elective for me, and I was pleasantly surprised at how much Ilearned, how much I enjoyed learning it, and how easy it was to learn it. Ians technology-driven teaching style is innovative and kept me engaged. Finally, the problem sets were il-lustrative and pitched at a level I felt was reasonable, yet challenging. Again, this coursewas incredible and Id recommend it to any graduate student who is even mildly interested.This class was wonderfully designed and taught. This was a fantastic course that I thinkreally did a good job of covering a wide range of topics at an appropriate level of depth.

Spring 12: PHYS401 Quantum Physics II found this course extremely enjoyable. It reminded me of why I decided to become a Physicsmajor. Professor Appelbaum was very knowledgeable and applied mathematical formalismsthat were originally unfamiliar but ultimately extremely helpful. Professor was very co-herent and very methodical. He taught the material very well and cared greatly about thestudents.

Fall 11: PHYS731 Solid State PhysicsI enjoyed the course immensely. Good lectures, difficult but rewarding homework. Over-all, a class I enjoyed and was worth taking.

Spring 11: PHYS401 Quantum Physics IThis was probably my favorite course that I have taken so far. I really appreciated the math-ematical derivations of universal mathematical concepts, and then seeing directly how theyapplied to quantum mechanics. This was in my opinion much better than simply stating theresults and then working with them. I also appreciated the focus on numerical analysis, whichallows one to gain a much stronger intuition about the subject than only working on the fewexamples that can be solved analytically. Overall it felt like I gained an excellent understand-ing of the basics of quantum mechanics, as well as a number of universal mathematical andanalytical skills. . . . this was easily one of the most engaging, challenging, and rewardingphysics courses I have taken at UMD. It was very refreshing to be able to spend less timecopying notes and more time absorbing the professors unique perspective on the topic. I hopeother students do not pass up an opportunity to take this course. . . . Ive never been moreexcited about a topic I was learning, and I believe that is all because of Dr. Appelbaum.

Fall 10: PHYS375 Experimental Physics III (Optics)Prof. Appelbaum was a good, enthusiastic, and helpful professor. Id highly recommendAppelbaum.

Spring 10: PHYS401 Quantum Physics IThis professor is by far one of the best lecturers Ive had at this university. His lecturescompliment the text, presenting material in different (often simpler) styles. He is very wellorganized (something Ive never seen in the phys. department), and has a well-designed websitewith easily accessible notes/assignments.

@ U. Delaware, ECE Dept.:

Spring 08: ELEG646 Nanoelectronic Device PrinciplesHelps a lot in and out of class. . . I like the computational methods used in micro- and nano-electronics, which was taught by the instructor. His lectures help promote my understandingof semiconductor devices to a higher level. . . Great class, well taught. Intense projects butvery helpful in understanding the subject.

Fall 07: ELEG340 Solid-State ElectronicsHighly knowledgeable. . . he was a great teacher and really knew what he was talking about. . . Morethan willing to provide help or extra material to students who seek it. . . genuinely caresabout how his students perform in his class. . . very helpful and open to any questions at anytime. . . Professor did a tremendous job teaching the subject. Lectures were very effective andclear. This class made me realize how much I love engineering. . .

Spring 07: ELEG240 Physical ElectronicsGreat teacher. . . effective, and helpful. . . available for help almost any time. . . the course hasbetter prepared me for my future engineering courses. . . the topics we covered were veryinteresting. . .

Fall 06: ELEG340 Solid-State ElectronicsProfessor provides slides with the material and explains the slides well. . . .Professor Appel-baum exhibits great knowledge of the subject material. Lectures are straightforward. . . Dr.Appelbaum was able to instill a passion for the subject matter. . . The level of caring presentedwas appropriate and genuine. . . overall this was one of my favorite courses this semester. . .

Spring 06: ELEG/PHYS667 Magnetism and SpintronicsThe professor is nice and well prepared. Thank you. . . .He is a good researcher with hugeknowledge in this field. Young, energetic and ambitious researcher, I learned a lot in depthfrom him. . . .The course should be made compulsory for students specializing in Magnetismand Spintronics related fields...

Fall 05: ELEG340 Solid-State ElectronicsThe instructor is one of, if not the best that I have had. . . He is very knowledgeable ofthe subject matter and communicates it well. . . He was also very helpful in office hours. . . .Professors knowledge of the material was thorough. Lectures were well presented. . . ProfessorAppelbaum is a very good professor. He is extremely smart and knowledgeable of the materialin this class. . . Very extensive knowledge of the material. . . I liked Appelbaums visual teachingmethod. . .

Fall 04: ELEG667-018/PHYS667-018 Magnetism and SpintronicsDr Appelbaum is a good instructor, helps students a lot, he supplies them with extra infor-mation, he is interested in the subject and is well-prepared. . . it was very beneficial for myresearch. Now I feel more comfortable in the literature. I got a better understanding of whatis going on in spintronics. . . the class was very well structured and included all the basics.In the presentations more advanced topics were included and the instructor made sure theexplanations were clear the most important points were made. . . . I enjoyed the course verymuch and it was very useful. . . .

Strengthening communication

Setting standards

Lecture materials

Subject matter

Student evaluation comment highlights

http://www.lulu.com/content/paperback-book/quantum-physics/14892135http://www.lulu.com/content/paperback-book/quantum-physics/14892135http://www.lulu.com/content/paperback-book/solid-state-physics/14362122

Spring 11: PHYS401 Quantum Physics IThis was probably my favorite course that I have taken so far. I really appreciatedthe mathematical derivations of universal mathematical concepts, and then seeingdirectly how they applied to quantum mechanics. This was in my opinion muchbetter than simply stating the results and then working with them. I also appreciatedthe focus on numerical analysis, which allows one to gain a much stronger intuitionabout the subject than only working on the few examples that can be solvedanalytically. Overall it felt like I gained an excellent understanding of the basics ofquantum mechanics, as well as a number of universal mathematical and analyticalskills. . . . this was easily one of the most engaging, challenging, and rewardingphysics courses I have taken at UMD. It was very refreshing to be able to spend lesstime copying notes and more time absorbing the professors unique perspective onthe topic. I hope other students do not pass up an opportunity to take this course.. . . Ive never been more excited about a topic I was learning, and I believe that isall because of Dr. Appelbaum.

Fall 10: PHYS375 Experimental Physics III (Optics)Prof. Appelbaum was a good, enthusiastic, and helpful professor. Id highlyrecommend Appelbaum.

Spring 10: PHYS401 Quantum Physics IThis professor is by far one of the best lecturers Ive had at this university. Hislectures compliment the text, presenting material in different (often simpler) styles.He is very well organized (something Ive never seen in the phys. department), andhas a well-designed website with easily accessible notes/assignments.

Fall 09: PHYS375 Experimental Physics III (Optics)Complete redesign of experiments: Matlab for data acquisition, replacement ofoptical hardware, manual rewrites, etc.

@ U. Delaware, ECE Dept.:

Spring 08: ELEG646 Nanoelectronic Device PrinciplesHelps a lot in and out of class. . . I like the computational methods used in micro-and nano-electronics, which was taught by the instructor. His lectures help promotemy understanding of semiconductor devices to a higher level. . . Great class, welltaught. Intense projects but very helpful in understanding the subject.

Fall 07: ELEG340 Solid-State ElectronicsHighly knowledgeable. . . he was a great teacher and really knew what he was talkingabout. . . More than willing to provide help or extra material to students who seekit. . . genuinely cares about how his students perform in his class. . . very helpful andopen to any questions at any time. . . Professor did a tremendous job teaching thesubject. Lectures were very effective and clear. This class made me realize howmuch i love engineering. . .

Spring 07: ELEG240 Physical ElectronicsGreat teacher. . . effective, and helpful. . . available for help almost any time. . . thecourse has better prepared me for my future engineering courses. . . the topics wecovered were very interesting. . .

Fall 06: ELEG340 Solid-State ElectronicsProfessor provides slides with the material and explains the slides well. . . .ProfessorAppelbaum exhibits great knowledge of the subject material. Lectures are straight-forward. . . Dr. Appelbaum was able to instill a passion for the subject matter. . . Thelevel of caring presented was appropriate and genuine. . . overall this was one of myfavorite courses this semester. . .

Spring 06: ELEG/PHYS667 Magnetism and SpintronicsThe professor is nice and well prepared. Thank you. . . .He is a good researcher withhuge knowledge in this field. Young, energetic and ambitious researcher, I learneda lot in depth from him. . . .The course should be made compulsory for studentsspecializing in Magnetism and Spintronics related fields...

Fall 05: ELEG340 Solid-State ElectronicsThe instructor is one of, if not the best that I have had. . . He is very knowledgeableof the subject matter and communicates it well. . . He was also very helpful in officehours. . . . Professors knowledge of the material was thorough. Lectures were wellpresented. . . Professor Appelbaum is a very good professor. He is extremely smartand knowledgeable of the material in this class. . . Very extensive knowledge of thematerial. . . I liked Appelbaums visual teaching method. . .

Fall 04: ELEG667-018/PHYS667-018 Magnetism and SpintronicsDr Appelbaum is a good instructor, helps students a lot, he supplies them withextra information, he is interested in the subject and is well-prepared. . . it was verybeneficial for my research. Now I feel more comfortable in the literature. I got abetter understanding of what is going on in spintronics. . . the class was very wellstructured and included all the basics. In the presentations more advanced topicswere included and the instructor made sure the explanations were clear the mostimportant points were made. . . . I enjoyed the course very much and it was veryuseful. . . .

ian appelbaum · ian appelbaum curriculum vitae address physical sciences complex, university of...

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