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Piers Coleman & Onur ErtenCenter for Materials Theory, Rutgers U, USA Royal Holloway, University of London, UK.
Magnetism meets TopologyTopological Kondo Insulators:
Piers Coleman, Rutgers CMT.
Happy Birthday Gil!
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Piers Coleman & Onur ErtenCenter for Materials Theory, Rutgers U, USA Royal Holloway, University of London, UK.
Magnetism meets TopologyTopological Kondo Insulators:
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Piers Coleman & Onur ErtenCenter for Materials Theory, Rutgers U, USA Royal Holloway, University of London, UK.
Magnetism meets TopologyTopological Kondo Insulators:
Collaborators
Vic Alexandrov, IAS Onur Erten, Rutgers
Maxim Dzero Kent State Kai Sun Michigan Victor Galitski Maryland Vic
Joel Moore, Berkeley Phil Anderson, Princeton Suchitra Sebastian Cambridge Gil Lonzarich Cambridge
Onur
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Piers Coleman & Onur ErtenCenter for Materials Theory, Rutgers U, USA Royal Holloway, University of London, UK.
Magnetism meets TopologyTopological Kondo Insulators:
Collaborators
Vic Alexandrov, IAS Onur Erten, Rutgers
Maxim Dzero Kent State Kai Sun Michigan Victor Galitski Maryland Vic
Joel Moore, Berkeley Phil Anderson, Princeton Suchitra Sebastian Cambridge Gil Lonzarich Cambridge
Onur
M. Dzero, K. Sun, V. Galitski, PC Phys. Rev. Lett. 104, 106408 (2010)T. Takimoto, J. Phys. Soc. Jpn. 80, 123710 (2011).
Maxim Dzero, Jing Xia, Victor Galitski, Piers Coleman, Annual Reviews CMP (2016), ArXiv 1506.05635V. Alexandrov, P. Coleman, O. Erten, Phys. Rev. Lett. 114:177202 (2015).
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Piers Coleman & Onur ErtenCenter for Materials Theory, Rutgers U, USA Royal Holloway, University of London, UK.
Magnetism meets TopologyTopological Kondo Insulators:
Outline
• SmB6 and the rise of topology• TKIs: a link with superfluid He-3• Is SmB6 topological?• The Magnetic Connection.
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Kondo insulators: History
Sm2.7+
B6
SmB6
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Kondo insulators: History
Sm2.7+
B6
SmB6
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Hybridization picture.
Mott Phil Mag, 30,403,1974
kEf
E(k)
H = (|kσ〉Vσα(k)〈α| + H.c)
Maple + Wohlleben, 1972
Allen and Martin, 1979
Kondo insulators: History
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Hybridization picture.
Mott Phil Mag, 30,403,1974
kEf
E(k)
H = (|kσ〉Vσα(k)〈α| + H.c)
Maple + Wohlleben, 1972
Allen and Martin, 1979
“In SmB6 and high-pressure SmS a very small gap separates occupied from unoccupied states, this in our view being due to hybridization of 4f and 4d bands.” Mott 1974
Kondo insulators: History
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Hybridization picture.
Mott Phil Mag, 30,403,1974
kEf
E(k)
H = (|kσ〉Vσα(k)〈α| + H.c)
Maple + Wohlleben, 1972
Allen and Martin, 1979
In SmB6 and high-pressure SmS a very small gap separates occupied from unoccupied states, this in our view being due to hybridization of 4f and 4d bands.
Kondo insulators: History
Cooley, Aronson, et al. 1995
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g=0 g=1 g=2 g=3g=genus
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g=0 g=1 g=2 g=3g=genus
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14π
∫κdA =
Ω4π
= (1 − g)
g=0 g=1 g=2 g=3g=genus
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Berry v. Klitzing Laughlin Thouless Haldane
von Klitzing, Dorda & Pepper (1980)
Integer Quantum Hall
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Berry v. Klitzing Laughlin Thouless Haldane
von Klitzing, Dorda & Pepper (1980)
Integer Quantum Hall
�ak = i∑
n=1,2N
〈un,k|∇k|un,k〉
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Berry v. Klitzing Laughlin Thouless Haldane
Kane Mele Zhang Molencamp Hasan Balents Moore Roy Fu
von Klitzing, Dorda & Pepper (1980)
Integer Quantum HallZ2 Topological Insulators
�ak = i∑
n=1,2N
〈un,k|∇k|un,k〉
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Conventional band insulator: adiabatic continuation of the vacuum.
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Topological insulator
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Topological insulator
Gap must close at interface betweentwo different vacua
Metallic surfaces.
: adiabatically disconnected from thevacuum.
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Tamm 1932, Shockley, Phys Rev, 56, 317 (1939): 1D TI
1D Topological Insulator
IgorTamm
WilliamShockley
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Tamm 1932, Shockley, Phys Rev, 56, 317 (1939): 1D TI
εp -+
-+
++ε-t
tp
V
1D Topological Insulator
IgorTamm
WilliamShockley
P=-1
P=+1
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Tamm 1932, Shockley, Phys Rev, 56, 317 (1939): 1D TI
εp -+
-+
++ε-t
tp
V
1D Topological Insulator
IgorTamm
WilliamShockley
P=-1
P=+1
Open BCs- broken translation symmetry odd/even states mix to form edge states.
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Band Crossing of odd and even parity states Yields a Z2 Topological Insulator (Fu, Kane, Mele, 2007)
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Band Crossing of odd and even parity states Yields a Z2 Topological Insulator (Fu, Kane, Mele, 2007)
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Band Crossing of odd and even parity states Yields a Z2 Topological Insulator (Fu, Kane, Mele, 2007)
Topological Texture of Berry Connection
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Band Crossing of odd and even parity states Yields a Z2 Topological Insulator (Fu, Kane, Mele, 2007)
Z2= 1 Z2= -1
Topological Texture of Berry Connection
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Band Crossing of odd and even parity states Yields a Z2 Topological Insulator (Fu, Kane, Mele, 2007)
Z2 =∏
i
δ(Γi)
Z2= -1Z2= 1
Topological Texture of Berry Connection
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Bi2Se3 , Bi2Te3, Sb2Te3
(Zhang et al ,Xia et al ,Chen et al, Hsieh et al (09))
FIG. 27 ARPES data for Bi2Se3 thin films of thickness (a) 1QL (b)2QL (c) 3QL (d) 5QL (e) 6QL, measured at room temperature (QLstands for quintuple layer). From Zhang et al., 2009.
FIG. 25 ARPES data for the dispersion of the surface states ofBi2Se3, along directions (a) Γ − M and (b) Γ − K in the surfaceBrillioun zone. Spin-resolved ARPES data is shown along Γ−M fora fixed energy in (d), from which the spin polarization in momentumspace (c) can be extracted. From Xia et al., 2009 and Hsieh et al.,2009.
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Bi2Se3 , Bi2Te3, Sb2Te3
(Zhang et al ,Xia et al ,Chen et al, Hsieh et al (09))
FIG. 27 ARPES data for Bi2Se3 thin films of thickness (a) 1QL (b)2QL (c) 3QL (d) 5QL (e) 6QL, measured at room temperature (QLstands for quintuple layer). From Zhang et al., 2009.
FIG. 25 ARPES data for the dispersion of the surface states ofBi2Se3, along directions (a) Γ − M and (b) Γ − K in the surfaceBrillioun zone. Spin-resolved ARPES data is shown along Γ−M fora fixed energy in (d), from which the spin polarization in momentumspace (c) can be extracted. From Xia et al., 2009 and Hsieh et al.,2009.
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Are Kondo insulators topological?
R. Martin & J. Allen, J. Applied Physics, 50,7561 (1979)
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Are Kondo insulators topological?
R. Martin & J. Allen, J. Applied Physics, 50,7561 (1979)
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Are Kondo insulators topological?
Dzero, Sun, Galitski, PC Phys. Rev. Lett. 104, 106408 (2010)
R. Martin & J. Allen, J. Applied Physics, 50,7561 (1979)
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Are Kondo insulators topological?
Dzero, Sun, Galitski, PC Phys. Rev. Lett. 104, 106408 (2010)
R. Martin & J. Allen, J. Applied Physics, 50,7561 (1979)
Many Body Localized
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Are Kondo insulators topological?
Dzero, Sun, Galitski, PC Phys. Rev. Lett. 104, 106408 (2010)
R. Martin & J. Allen, J. Applied Physics, 50,7561 (1979)
Many Body Delocalization
Many Body Localized
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Are Kondo insulators topological?
Dzero, Sun, Galitski, PC Phys. Rev. Lett. 104, 106408 (2010)
R. Martin & J. Allen, J. Applied Physics, 50,7561 (1979)
Many Body Delocalization
Many Body Localized
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Are Kondo insulators topological?
Dzero, Sun, Galitski, PC Phys. Rev. Lett. 104, 106408 (2010)
Band Theory SmB6: T. Takimoto, J. Phys. Soc. Jpn. 80, 123710 (2011).
Maxim Dzero, Kai Sun, Piers Coleman and Victor Galitski, Phys. Rev. B 85 , 045130-045140 (2012).
Victor Alexandrov, Maxim Dzero and Piers Coleman PRL (2013).
Gutzwiller + Band Theory F. Lu, J. Zhao, H. Weng, Z. Fang and X. Dai, Phys. Rev. Lett. 110, 096401 (2013).
R. Martin & J. Allen, J. Applied Physics, 50,7561 (1979)
Many Body Delocalization
Many Body Localized
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Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
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Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
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Three crossings: THREE DIRAC CONESON SURFACE.
Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
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Three crossings: THREE DIRAC CONESON SURFACE.
Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
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Three crossings: THREE DIRAC CONESON SURFACE.
Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
sk = (sin kx, sin ky, sin kz) ∼ k
d(k) = ks(k) = k
X
Vαβ(k) = Vsk · �σαβ
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Three crossings: THREE DIRAC CONESON SURFACE.Hybridization of f (P=+) and d (P=-) vanishes at X point.
Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
sk = (sin kx, sin ky, sin kz) ∼ k
d(k) = ks(k) = k
X
Vαβ(k) = Vsk · �σαβ
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Three crossings: THREE DIRAC CONESON SURFACE.Hybridization of f (P=+) and d (P=-) vanishes at X point.
Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
=3
H(k) =(
εk V sk · �σV sk · �σ ε f k
)
sk = (sin kx, sin ky, sin kz) ∼ k
d(k) = ks(k) = k
X
Vαβ(k) = Vsk · �σαβ
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Three crossings: THREE DIRAC CONESON SURFACE.Hybridization of f (P=+) and d (P=-) vanishes at X point.
Dzero et al, Annual Reviews of Condensed Matter Physics (2016), arXiv 1506.05635
=3
H(k) =(
εk V sk · �σV sk · �σ ε f k
)Like He-3B: an adaptive insulator.
sk = (sin kx, sin ky, sin kz) ∼ k
d(k) = ks(k) = k
X
Vαβ(k) = Vsk · �σαβ
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(a)
F. Lu, et al., Phys. Rev. Lett. 110:096401 (2013)Gutzwiller + DFT
Three crossings: THREE DIRAC CONESON SURFACE.
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Is SmB6 a topological Kondo insulator?
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SmB6 Surface Conductivity
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SmB6 Surface Conductivity
RVert
RLat u
Wolgast et al, Phys Rev B, 88, 180405 (2013)D. J. Kim et al, Scientific Reports 3, 3150 (2013)
Hall constant derives from the Surface.
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SmB6 Surface Conductivity
RVert
RLat u
Wolgast et al, Phys Rev B, 88, 180405 (2013)D. J. Kim et al, Scientific Reports 3, 3150 (2013)
Hall constant derives from the Surface.
Large Vertical Resistance indicatesconductivity is from the surface.
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SmB6 Surface Conductivity Bulk Insulator
Surface Conductivity
Robustness/Sensitivity to potential/magnetic scattering.
RVert
RLat u
Wolgast et al, Phys Rev B, 88, 180405 (2013)D. J. Kim et al, Scientific Reports 3, 3150 (2013)
Hall constant derives from the Surface.
Large Vertical Resistance indicatesconductivity is from the surface.
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SmB6 TKI Check List.
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SmB6 TKI Check List.
4f j=5/2, 7/2Multiplets
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SmB6 TKI Check List.
5d-band
4f j=5/2, 7/2Multiplets
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SmB6 TKI Check List.
5d-band
4f j=5/2, 7/2Multiplets
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SmB6 TKI Check List.
5d-band
4f j=5/2, 7/2Multiplets
Odd number (3) of Surface FS (ARPES, dHVA, STM).
d-band crossing at X points
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Nan Xu , X. Shi , P. Biswas , C. Matt , R. Dhaka , Y. Huang , N. Plumb , M. Radovic , J. Dil , E. Pomjakushina , K. Conder , A. Amato , Z. Salman , D. Paul , J. Mesot , Hong Ding , Ming Shi
Spin Resolved ARPES
Nature Communications Volume: 5, 4566 (2014)
Low
FHigh
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Nan Xu , X. Shi , P. Biswas , C. Matt , R. Dhaka , Y. Huang , N. Plumb , M. Radovic , J. Dil , E. Pomjakushina , K. Conder , A. Amato , Z. Salman , D. Paul , J. Mesot , Hong Ding , Ming Shi
Spin Resolved ARPES
Nature Communications Volume: 5, 4566 (2014)
Bulkf states
�
� Γ
M
X
_
__ kx
ky
Low
FHigh
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Nan Xu , X. Shi , P. Biswas , C. Matt , R. Dhaka , Y. Huang , N. Plumb , M. Radovic , J. Dil , E. Pomjakushina , K. Conder , A. Amato , Z. Salman , D. Paul , J. Mesot , Hong Ding , Ming Shi
Spin Resolved ARPES
Nature Communications Volume: 5, 4566 (2014)
Bulkf states
�
� Γ
M
X
_
__ kx
ky
Low
FHigh
But no consensus yet!
arxiv/1502.01542
Phys. Rev. Lett. 111, 216402 (2013)
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I. Kondo BreakdownII. Pressure:AFMIII. Neutrons: ExcitonIV. Field: dHvA and Quantum Criticality.
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V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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ARPES: vs~ 220-300 meVA
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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ARPES: vs~ 220-300 meVA
10x too small!Theory: vs~ 30-50 meVA
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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ARPES: vs~ 220-300 meVA
10x too small!Theory: vs~ 30-50 meVA
Lower co-ordinationat surface dramaticallysuppresses the Kondotemperature
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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ARPES: vs~ 220-300 meVA
10x too small!Theory: vs~ 30-50 meVA
Lower co-ordinationat surface dramaticallysuppresses the Kondotemperature
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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ARPES: vs~ 220-300 meVA
10x too small!Theory: vs~ 30-50 meVA
Kondo Breakdown at surface.
Lower co-ordinationat surface dramaticallysuppresses the Kondotemperature
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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ARPES: vs~ 220-300 meVA
10x too small! AFS/(2π)2 = Δnf
Theory: vs~ 30-50 meVA
Kondo Breakdown at surface.
Lower co-ordinationat surface dramaticallysuppresses the Kondotemperature
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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ARPES: vs~ 220-300 meVA
10x too small! AFS/(2π)2 = Δnf
Breakdown of Kondo effect at surface causes surface Dirac cones to dope,submerging the Dirac point and considerably enhancing the Fermi velocity.
Theory: vs~ 30-50 meVA
Kondo Breakdown at surface.
Lower co-ordinationat surface dramaticallysuppresses the Kondotemperature
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.I. Kondo Breakdown
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I. Kondo Breakdown
AFS/(2π)2 = Δnf
Kondo Breakdown at surface.
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.
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I. Kondo Breakdown
AFS/(2π)2 = Δnf
Kondo Breakdown at surface.
Local moments on the surface form a 2D Kondo lattice with spin-orbit locked conduction bands.
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.
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I. Kondo Breakdown
AFS/(2π)2 = Δnf
Kondo Breakdown at surface.
Local moments on the surface form a 2D Kondo lattice with spin-orbit locked conduction bands.
Surface Kondo physics? Magnetism, QCP even superconductivity.
V. Alexandrov, P. Coleman, O. Erten,
Phys. Rev. Lett. 114:177202 2015.
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T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
AFM?
Sm
B6
SmB6
A. Barla et al, PRL 94, 2005
II. The effect of Pressure: AFM
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T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
Fuhrman et al, PRL 114, 036401 (2015)
III. Magnetic Fluctuations
AFM Fluctuations
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Fuhrman et al, PRL 114, 036401 (2015)
RPATheory
AFM Fluctuations
III. Magnetic Fluctuations
T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
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T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
IV. Field effect
H
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Cooley et al, 1999
T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
IV. Field effect
H
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Cooley et al, 1999
T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
?
IV. Field effect
H
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Cooley et al, 1999
T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
6GPaQC
?
Hc
>160T?
IV. Field effect
H
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Cooley et al, 1999
T
P
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
6GPaQC
?
L=5, S=5/2, J=5/2, g~0.2-0.3Field effect is ORBITALHc
>160T?
IV. Field effect
H
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T
P
H
50KGap opens
0.3-4K plateau
6GPaQCP?
FM, AFM?
6GPaQC
Hc
>160T?
IV. Field effect
2D fluctuations:
G. Li et al, Science 346, 1208 (2014).
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IV. Field effect
2D surface states:
G. Li et al, Science 346, 1208 (2014).
Tan et al, Science (2015).
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IV. Field effect
2D surface states:
G. Li et al, Science 346, 1208 (2014).
Tan et al, Science (2015).
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IV. Field effect
2D surface states:
G. Li et al, Science 346, 1208 (2014).
Tan et al, Science (2015). 3D orbits!
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IV. Field effect
2D surface states:
G. Li et al, Science 346, 1208 (2014).
Tan et al, Science (2015). 3D orbits!
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IV. Field effect
2D surface states:
G. Li et al, Science 346, 1208 (2014).
Tan et al, Science (2015). 3D orbits! 6x Rise in N(0)*: Q Criticality?
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IV. Field effect
Tan et al, Science (2015). 3D orbits! 6x Rise in N(0)*: Q Criticality?
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IV. Field effect
Tan et al, Science (2015). 3D orbits! 6x Rise in N(0)*: Q Criticality? • 3D FS in a bulk insulator !
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IV. Field effect
Tan et al, Science (2015). 3D orbits! 6x Rise in N(0)*: Q Criticality? • 3D FS in a bulk insulator !
• ωc ≳ V ? (Knolle &Cooper arXiv 1507.00885)
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IV. Field effect
Tan et al, Science (2015). 3D orbits! 6x Rise in N(0)*: Q Criticality? • 3D FS in a bulk insulator !
• ωc ≳ V ? (Knolle &Cooper arXiv 1507.00885)
• Majorana FS? Are KI gapless? ( Baskaran arXiv 1507 to appear;
Miranda, PC, Tsvelik, Physica B, 186-188, 362, 1993)
• Quantum Criitcal phase separation?
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Piers Coleman, Rutgers CMT.
Congratulations Gil!
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