Closing the gaps in our understanding of the pseudogap
· Invited
Abstract
In this talk, I will review recent theoretical progress in understanding the pseudogap phenomenon in the two-dimensional Hubbard model, in relation to hole-doped cuprate superconductors. I will show that two independent computational methods (cluster extensions of dynamical mean-field theory, and lattice diagrammatic Monte Carlo) yield quantitatively consistent results. These two methods indicate that short-range antiferromagnetic correlations are responsible for the opening of the pseudogap in the strong-coupling regime. The Fermi surface is strongly modified by interactions, and a pseudogap only opens when this surface is hole-like. For small to moderate ratios of t’/t, the collapse of the pseudogap is found to coincide with the Lifshitz transition of the Fermi surface from hole-like to electron-like, in agreement with experimental observations. These findings can be rationalized within an SU(2) gauge theory of a metal with short-range fluctuating antiferromagnetic order, in which topological order is responsible for the reconstruction of the Fermi surface into pockets.
References: Wei Wu et al. Phys Rev B 96, 041105R (2017); arXiv:1707.06602. M.Scheurer et al., in preparation.
References: Wei Wu et al. Phys Rev B 96, 041105R (2017); arXiv:1707.06602. M.Scheurer et al., in preparation.
*This work was supported by: the Simons Foundation Many-Electron Collaboration, the European Research Council (project ERC-319286-`QMAC'), the Swiss National Supercomputing Centre (CSCS, project s575), the NSF under Grant DMR-1664842 and MURI grant W911NF-14-1-0003 from ARO. The Flatiron Institute is supp
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Presenters
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Antoine Georges
- CNRS, Université Paris-Saclay
- Center for Computational Quantum Physics, Flatiron Institute - Simons Foundation
- College de France
- Centre de Physique Theorique, Ecole Polytechnique, CNRS, Universite Paris-Saclay
- Center for Computational Quantum Physics, Flatiron Institute