the phase diagram of the cuprates and the quantum phase transitions of metals in two dimensions...
TRANSCRIPT
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The phase diagram of the cuprates andthe quantum phase
transitions of metals in two dimensions
HARVARDTalk online: sachdev.physics.harvard.edu
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Max Metlitski, HarvardMax Metlitski, Harvard
Frederik Denef, HarvardLars Fritz, Cologne
Victor Galitski, MarylandSean Hartnoll, Harvard
Christopher Herzog, Princeton
Pavel Kovtun, VictoriaMarkus Muller, TriesteJorg Schmalian, Iowa
Dam Son, Washington
Frederik Denef, HarvardLars Fritz, Cologne
Victor Galitski, MarylandSean Hartnoll, Harvard
Christopher Herzog, Princeton
Pavel Kovtun, VictoriaMarkus Muller, TriesteJorg Schmalian, Iowa
Dam Son, Washington
HARVARDEun Gook Moon, Harvard
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1. Graphene `Topological’ Fermi surface transition
2. The cuprate superconductors Fluctuating spin density waves, and
pairing by gauge fluctuations
Outline
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1. Graphene `Topological’ Fermi surface transition
2. The cuprate superconductors Fluctuating spin density waves, and
pairing by gauge fluctuations
Outline
![Page 5: The phase diagram of the cuprates and the quantum phase transitions of metals in two dimensions HARVARD Talk online: sachdev.physics.harvard.edu](https://reader038.vdocument.in/reader038/viewer/2022110208/56649dd95503460f94ace0f2/html5/thumbnails/5.jpg)
Graphene
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Graphene
Conical Dirac dispersion
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Quantum phase transition in graphene tuned by a gate voltage
Electron Fermi
surface
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Hole Fermi surface
Electron Fermi
surface
Quantum phase transition in graphene tuned by a gate voltage
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Electron Fermi
surface
Hole Fermi surface
There must be an intermediate
quantum critical point where the Fermi surfaces
reduce to a Dirac point
Quantum phase transition in graphene tuned by a gate voltage
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Quantum critical graphene
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Quantum critical
Quantum phase transition in graphene
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Quantum critical transport
S. Sachdev, Quantum Phase Transitions, Cambridge (1999).
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Quantum critical transport
K. Damle and S. Sachdev, Phys. Rev. B 56, 8714 (1997).
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Quantum critical transport
P. Kovtun, D. T. Son, and A. Starinets, Phys. Rev. Lett. 94, 11601 (2005)
, 8714 (1997).
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Quantum critical transport in graphene
L. Fritz, J. Schmalian, M. Müller and S. Sachdev, Physical Review B 78, 085416 (2008) M. Müller, J. Schmalian, and L. Fritz, Physical Review Letters 103, 025301 (2009)
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S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
Quantum critical
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S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
Quantum critical
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Magnetohydrodynamics of quantum criticality
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
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Magnetohydrodynamics of quantum criticality
S.A. Hartnoll, P.K. Kovtun, M. Müller, and S. Sachdev, Phys. Rev. B 76 144502 (2007)
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Magnetohydrodynamics of quantum criticality
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Magnetohydrodynamics of quantum criticality
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Magnetohydrodynamics of quantum criticality
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1. Graphene `Topological’ Fermi surface transition
2. The cuprate superconductors Fluctuating spin density waves, and
pairing by gauge fluctuations
Outline
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1. Graphene `Topological’ Fermi surface transition
2. The cuprate superconductors Fluctuating spin density waves, and
pairing by gauge fluctuations
Outline
![Page 25: The phase diagram of the cuprates and the quantum phase transitions of metals in two dimensions HARVARD Talk online: sachdev.physics.harvard.edu](https://reader038.vdocument.in/reader038/viewer/2022110208/56649dd95503460f94ace0f2/html5/thumbnails/25.jpg)
The cuprate superconductors
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Central ingredients in cuprate phase diagram: antiferromagnetism,
superconductivity, and change in Fermi surface
StrangeMetal
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Fermi surface+antiferromagnetismHole
states occupied
Electron states
occupied
+
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Fermi surfaces in electron- and hole-doped cuprates
Hole states
occupied
Electron states
occupied
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Spin density wave theory
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S. Sachdev, A. V. Chubukov, and A. Sokol, Phys. Rev. B 51, 14874 (1995). A. V. Chubukov and D. K. Morr, Physics Reports 288, 355 (1997).
Hole pockets
Electron pockets
Hole-doped cuprates
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S. Sachdev, A. V. Chubukov, and A. Sokol, Phys. Rev. B 51, 14874 (1995). A. V. Chubukov and D. K. Morr, Physics Reports 288, 355 (1997).
Hole pockets
Electron pockets
Hole-doped cuprates
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S. Sachdev, A. V. Chubukov, and A. Sokol, Phys. Rev. B 51, 14874 (1995). A. V. Chubukov and D. K. Morr, Physics Reports 288, 355 (1997).
Hole pockets
Electron pockets
Hole-doped cuprates
Hot spots
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S. Sachdev, A. V. Chubukov, and A. Sokol, Phys. Rev. B 51, 14874 (1995). A. V. Chubukov and D. K. Morr, Physics Reports 288, 355 (1997).
Hole pockets
Electron pockets
Hole-doped cuprates
Fermi surface breaks up at hot spotsinto electron and hole “pockets”
Hole pockets
Hot spots
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S. Sachdev, A. V. Chubukov, and A. Sokol, Phys. Rev. B 51, 14874 (1995). A. V. Chubukov and D. K. Morr, Physics Reports 288, 355 (1997).
Hole pockets
Electron pockets
Hole-doped cuprates
Fermi surface breaks up at hot spotsinto electron and hole “pockets”
Hot spots
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arXiv:0912.3022
Fermi liquid behaviour in an underdoped high Tc superconductor
Suchitra E. Sebastian, N. Harrison, M. M. Altarawneh, Ruixing Liang, D. A. Bonn, W. N. Hardy, and G. G. Lonzarich
Evidence for small Fermi pockets
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Spin density wave theory in hole-doped cuprates
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Fermi pockets in hole-doped cuprates
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Charge carriers in the lightly-doped cuprates with Neel order
Electron pockets Hole
pockets
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Theory of underdoped cuprates
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Higgs Coulomb
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Higgs Coulomb
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Complete theory
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R. K. Kaul, M. Metlitksi, S. Sachdev, and Cenke Xu, Phys. Rev. B 78, 045110 (2008).
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T=0 Phase diagram
Higgs Coulomb
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T=0 Phase diagram
d-wave superconductivity
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T=0 Phase diagram
d-wave superconductivity
Competition between antiferromagnetism and
superconductivity shrinks region of antiferromagnetic order: feedback of “probe fermions” on CFT is important
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Theory of quantum criticality in the cuprates
T*
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Theory of quantum criticality in the cuprates
T*
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T*
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G. Knebel, D. Aoki, and J. Flouquet, arXiv:0911.5223
Similar phase diagram for CeRhIn5
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T*
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T*
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Similar phase diagram for the pnictides
Ishida, Nakai, and HosonoarXiv:0906.2045v1
S. Nandi, M. G. Kim, A. Kreyssig, R. M. Fernandes, D. K. Pratt, A. Thaler, N. Ni, S. L. Bud'ko, P. C. Canfield, J. Schmalian, R. J. McQueeney, A. I. Goldman, arXiv:0911.3136.
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T*
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S. A. Kivelson, E. Fradkin, and V. J. Emery, Nature 393, 550 (1998).R. K. Kaul, M. Metlitksi, S. Sachdev, and Cenke Xu, Phys. Rev. B 78, 045110 (2008).
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S. A. Kivelson, E. Fradkin, and V. J. Emery, Nature 393, 550 (1998).R. K. Kaul, M. Metlitksi, S. Sachdev, and Cenke Xu, Phys. Rev. B 78, 045110 (2008).
![Page 72: The phase diagram of the cuprates and the quantum phase transitions of metals in two dimensions HARVARD Talk online: sachdev.physics.harvard.edu](https://reader038.vdocument.in/reader038/viewer/2022110208/56649dd95503460f94ace0f2/html5/thumbnails/72.jpg)
T*
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R. K. Kaul, M. Metlitksi, S. Sachdev, and Cenke Xu, Physical Review B 78, 045110 (2008).
Onset of superconductiv
ity disrupts SDW order, but
VBS/CDW/Ising-nematic ordering can
survive
VBS/CDW and/orIsing-nematic order
TI-n
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General theory of finite temperature dynamics and
transport near quantum critical points, with
applications to antiferromagnets, graphene,
and superconductors
Conclusions
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The AdS/CFT offers promise in providing a new
understanding of strongly interacting quantum matter at
non-zero density
Conclusions
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Conclusions
Gauge theory for pairing of Fermi pockets in a metal with fluctuating
spin density wave order: Many qualitative similarities to holographic strange metals and
superconductors