eth – fast focus course “time-dependent density-functional
TRANSCRIPT
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Max Planck Institute for the Structure and Dynamics of Matter
Max Planck Institute for the Structure and Dynamics of Matter, Hamburg, Germany
Angel Rubio
ETH – FAST focus course
“Time-dependent density-functional theory (TDDFT) and Many-Body Techniques”
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Max Planck Institute for the Structure and Dynamics of Matter
Time dependent DFT
1) Spectroscopy2) Real Time dynamics
IMPRS-UFAST focus course “Time-dependent density-functional theory (TDDFT) and Many-Body Techniques”
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Max Planck Institute for the Structure and Dynamics of Matter
OUTLINE
Introduction: Framing the lectures:Excitations; response concepts
Illustration: Some applications
Selective bond-breakingHigh-harmonic generation
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Max Planck Institute for the Structure and Dynamics of Matter
Time and size scales for REAL systemsSetting up the stage
2013 Nobel Prize in Chemistry, Karplus, Levitt and Warshel
+
environment(photons, reservoirs..)
“Open Quantum Systems”
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Max Planck Institute for the Structure and Dynamics of Matter
Dark Structures in Molecular Radiationless Transitions Determined by Ultrafast Diffraction, Science, Vol 307, 558-563 (2005)
Interrogating Molecules?
Science, Nov. 2008
R. J. Levis et al, Science 292, 709(2001)
Quantum control Theory
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Max Planck Institute for the Structure and Dynamics of Matter
Excitations in bio-systems: encouraging results!!Green fluorescent protein and their mutants (2008, Nobel prize in Chemistry)
(Aequorea victoria: jellyfish)
M.A.L Marques, X. Lopez, D. Varsano, A. Castro, and A. R. Phys. Rev. Lett. 90, 158101 (2003)
Some biophysical processes
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Max Planck Institute for the Structure and Dynamics of Matter
Small is different: atoms and molecules as our building blocks
NEW CONCEPTS
Nanoelectronics + Nanoptics + Nanophononics
Economist, May2003
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Max Planck Institute for the Structure and Dynamics of Matter
Carbon nanotubes: mass transport
B.C. Regan et al, Nature 428, 924 (2004)
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Max Planck Institute for the Structure and Dynamics of Matter
Why Theoretical Spectroscopy?
“Excitations”
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Max Planck Institute for the Structure and Dynamics of Matter
Qbit-control
Leds and laser diodsefficiency
***Seeing is believing*****
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Max Planck Institute for the Structure and Dynamics of Matter
***Seeing is believing*****
if you understand what you see!!!
m
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Max Planck Institute for the Structure and Dynamics of Matter
Transient Absorption and Photoelectron Spectroscopies
Time resolved pump-probe spectroscopyImage reconstruction, monitoring electron-ion dynamics,
time-dependent band-structure (“light induced topological states”)
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Max Planck Institute for the Structure and Dynamics of Matter
Theoretical Spectroscopy Framework
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Max Planck Institute for the Structure and Dynamics of Matter
Physical Processes: Spectroscopies
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Max Planck Institute for the Structure and Dynamics of Matter
Introduding a negative bare charge q=-1 in a nanostructure: monitorise the time evolution of the electronic
density (TDDFT calculation)
q=-1
‘Bare particles get dressed’Huber et al.,
Nature 414, 286 (2001)
Time required for building up of screening?
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Max Planck Institute for the Structure and Dynamics of Matter
Time-dependent phenomena!
Photoexcitation and relaxation
“pump-probe”
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Max Planck Institute for the Structure and Dynamics of Matter
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Max Planck Institute for the Structure and Dynamics of MatterSee review: G. Onida, L. Reining and AR, Rev. Mod. Phys. 74, 601 (2002)
Electronic properties of a many body system
Ground state
density n(r)yes, LDA, GGA's
n(r,t) and/or j(r,t)
G1, total energy
G2
yes
Excited states
Corrections toKS eigenvalues?
Yes, non-linear phenomena and
time-resolved spectroscopies
Quasiparticle excitationsIP and EA
optical absorption
yes, in some cases!
Scheme
DFT
TDDFT
MBPT
QM
Disadvantages
XC-func.
(r,r') (w)dependence
Comput.
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Max Planck Institute for the Structure and Dynamics of Matter
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Max Planck Institute for the Structure and Dynamics of Matter
What is a spectrum?
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Max Planck Institute for the Structure and Dynamics of Matter
Vinduced
= δn v + fxcδn
Hartree
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Max Planck Institute for the Structure and Dynamics of Matter
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Max Planck Institute for the Structure and Dynamics of Matter
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Max Planck Institute for the Structure and Dynamics of Matter
Theoretical Framework
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Max Planck Institute for the Structure and Dynamics of Matter
Theoretical Framework(s) DFT & TDDFT Nobel Prize Chemistry 1998
The ground state energy of a many body system is a unique functional of the density i.e, can be inverted Hohenberg-Kohn (1964)
The functional has a minimum at the 'equilibrium' density
Ψ(r1 ,r2 , .... ,rN )=Ψ[n(r )]→ E [Rions]=minn ⟨ΨHeΨ ⟩≡minnE[n]
TDDFT: All observables are functionals of n(r,t) (Runge&Gross 1984)
Linear and non linear phenomena accessible Octopus Code http://www.tddft.org
Time-Dependent Density Functional Theory, Lecture Notes in Physics, Springer Vols. 837, 706 (2012, 2006)
DFT Success “~chemical accuracy”
n(r )=n[Ψ]=⟨∑iδ(r−r i) ⟩
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Max Planck Institute for the Structure and Dynamics of Matter
Theoretical Framework(s) DFT & TDDFT Nobel Prize Chemistry 1998
The ground state energy of a many body system is a unique functional of the density i.e, can be inverted Hohenberg-Kohn (1964)
The functional has a minimum at the 'equilibrium' density
Ψ(r1 ,r2 , .... ,rN )=Ψ[n(r )]→ E [Rions]=minn ⟨ΨHeΨ ⟩≡minnE[n]
DFT Success “~chemical accuracy”
n(r )=n[Ψ]=⟨∑iδ(r−r i) ⟩
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Max Planck Institute for the Structure and Dynamics of Matter
Many Body Perturbation Theory (MPBT)
Disucussed in detail by G. Kresse this morning
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Max Planck Institute for the Structure and Dynamics of Matter
Time Dependent Density Functional Theory (Runge and Gross 1984):
All observables are functionals of the TD density
?One-to-one correspondence between the time-dependent density and the external potential, v(r,t) <------> r(r,t)
Time-Dependent Density Functional Theory, Lecture Notes in Physics, Vol. 706 (Springer, Berlin, 2006)
Same time-dependent
density n(r,t)
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Max Planck Institute for the Structure and Dynamics of Matter
TDDFT: Ehrenfest dynamics (non adiabatic)
All observables are functionals of the TD density (Runge and Gross 1984)
MI R̈I=−∇ IE [ψ ,R]
i ℏ ddt
Φ=H Φ → i ℏ ddt
ψi=H KS [ {ψ j }] ψi , i=1,⋯N ?H KS=
ℏ2
2m(i∇−
ec ℏ
(A+A xc))2
+V external+V hartree+V exchange+V correlation
Octopus Code http://www.tddft.org
Linear and non linear phenomena accessible
Time-Dependent Density Functional Theory, Lecture Notes in Physics, Vol. 706 (Springer, Berlin, 2006) and
Fundamentals of Time-Dependent Density Functional Theory; Springer Lecture Notes in Physics, Vol. 837 (2012)
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potential
t (R)| g>
|e>
|y(t)>=C1(t)|e>+C2(t)|g> ????
beyond BO
F = ma
Electron dynamics
MD
within BO
Ehrenfest's dynamics (non-adiabatic)
i ∂Ψ∂ t
=H Ψ H Φ=E Φ
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Max Planck Institute for the Structure and Dynamics of Matter
First principles molecular dynamics
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Max Planck Institute for the Structure and Dynamics of Matter
TDDFT formulation for BO-MD dynamics: Ehrenfest dynamics (non adiabatic)
The equation of motion without external field for simplicity
iμ ∂∂ t
ψi=[−ℏ2
2m∇
2+V ion+V H+V xc] ψi
J.L. Alonso, X. Andrade, P. Echenique, F. Falceto, D. Prada, AR PRL (2008), JCTC (2009), NJP (2010)
MI R̈I=−∇ IE [ψ ,R]
Non-adiabatic couplings:
See for example review by N.L Doltsinis and D. Marx, J.Theo.Comp.Chem 1, 319 (2002) and the books on TDDFT Springer Lecture Notes in Physics Vol. 706 (2006) and Vol. 837 (2012)
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Max Planck Institute for the Structure and Dynamics of Matter
TDDFT formulation for BO-MD dynamics: performance
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Max Planck Institute for the Structure and Dynamics of Matter
Femtosecond dynamics: test photodissociation of a dimer (Na2
+).
80fs
A. Castro, M.L. Marques. J.A. Alonso, G.F. Bertsch and AR (2003)
w=3.2eV
w =2.5eV
Time resolved Vibrational Spectroscopy: Raman
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Max Planck Institute for the Structure and Dynamics of Matter
Linear response
tickle the systemobserve how thesystem respondsat a later time
density response
perturbationdensity-densityresponse function
(r,t)(r´,t´)
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TDDFT does the job for you!!!
δ ( )=n w χ( )w Vext( )w however the KS system δ ( )=n w Χ
( )w V
eff( )w
=0 0v f xc
0 r ,r ' , w=∑ij f j− f i
icr jr i r ' j
cr '
i− j−wf xc r , r ' ,=
V xc r ,
n r ,
Linear Response
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How to solve the linear response equations
(2) Time propagation
Propagation Scheme:Apply a perturbation of the form δv
ext (r,t) = −k
zδ(t) to
the ground state of the system●At t = 0+ the Kohn-Sham orbitals are f
i(r,t=0+)= eikz f
i(r )
●Propagate these KS wave-functions for a (in)finite time.●The dynamical polarizability can be obtained from a(w)=-k-1∑
i<f
i| z |f
i>
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How to solve the linear response equations
(1) Sum over states: 0 r ,r ' ,w=∑ij f j− f i
icr jr i r ' j
cr '
i− j−w
=0 0v f xc
Cassida's approach
[1−v f xc 0]=0
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How to solve the linear response equations
(3) Density Functional Perturbation Theory
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Optical response:
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Transient Absorption Spectroscopy
““Unperturbed” Time-dependent HamiltonianUnperturbed” Time-dependent Hamiltonian““Unperturbed” Time-dependent HamiltonianUnperturbed” Time-dependent Hamiltonian
: static Hamiltonian
: “pump” laser pulse couple
: initially the system is at an equilibrium state
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Measured by the variation of the expectation value of some observable Â.
ResponseResponseResponseResponse
The response will be a functional of both pump and probe pulses
Apply a weak probe pulse:
The non-equilibrium response function is:
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Two excited states, for which the absorption spectrum shows two spectral features and
Model SystemModel SystemModel SystemModel System
The on/off-resonance excitation induces change of absorbance
Diagonal peaks: same resonance is pumped and probed.
Cross peaks: indicate a cross-correlation
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Max Planck Institute for the Structure and Dynamics of Matter
Problems with extended systems in finite fields?
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Max Planck Institute for the Structure and Dynamics of Matter
Macroscopic Polarisation Theory and real-time simulation
E⃗=−1c
d A⃗(t )d t
i ℏ ∂∂ t
ψi=[ 12m
( p⃗+ec
A⃗ )2
+V ion+V H+V xc ]ψi
14π
d2 A⃗
dt2=−e2 n
mA⃗−c
eV∑i
<ψi|p⃗m|ψi >=c2 jmac(t )=−c2 d P⃗( t )
dt
G.F. Bertsch, J.I. Iwata, AR, K. Yabana, PRB62, 7998 (2000)
A(t) = Aext
(t) + Aind
(t) Emac
= 4p P(t)
H= H + H
em P=polarisation
What is the link to the “modern theory of polarisation”? (see the recent review by Vanderbilt, Resta)
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Max Planck Institute for the Structure and Dynamics of Matter
Macroscopic Polarisation Theory <-->real-time A(t)
Berry Phase
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H2 molecular chains (infinite long case)
D. Varsano, A. Marini, AR PRL (2008)
Dimerised
equidistant
Metallic
versus
semiconducting
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Optimal control (quantum)
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What makes experimental “control” possible
● Existence of laser sources, since the 1960’s.● Femto-second laser sources, which allow for fast processes
(avoiding decoherence), and extending the band-width.● High-intensities.● Laser shapers.● Learning-loops algorithms.
Interrogating Molecules?Science, Nov. 2008
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Optimal control theory
Key question: What is the laser pulse that drives the system intoa predefined goal?
Procedure: Define a target operator Ô and at the end of thelaser interaction (t = T) maximize the functional
W. Zhu, J. Botina, H. Rabitz, JCP 108, 1953 (1998)
Ô = |F> <F|F F target state
Example: High harmonic generation and selective bond-breaking
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Tailoring HHGHHG consists of the emission of integer multiples of the carrier frequency of a driving laser, due to its highly non-linear interaction with matter. It can be explained with the so-called 3-steps model:
Typically, the HH spectrum (emission intensity vs. photon frequency) consists of a rapid intensity decrease, a plateau, and a cut-off.
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Max Planck Institute for the Structure and Dynamics of Matter
Tailoring HHG
7th 13th
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Max Planck Institute for the Structure and Dynamics of Matter
K. Kriger, A. Castro, E.K.U. Gross, (unpublished)
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Max Planck Institute for the Structure and Dynamics of Matter
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Max Planck Institute for the Structure and Dynamics of Matter
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Max Planck Institute for the Structure and Dynamics of Matter
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Max Planck Institute for the Structure and Dynamics of Matter