Pseudogap and Fermi-Surface Topology in the Two-Dimensional Hubbard Model

One of the distinctive features of hole-doped cuprate superconductors is the onset of a “pseudogap” below a temperatureT*. Recent experiments suggest that there may be a connection between the existence of the pseudogap and the topology of the Fermi surface. Here, we address this issue by studying t...

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Bibliographic Details
Published inPhysical review. X Vol. 8; no. 2; p. 021048
Main Authors Wu, Wei, Scheurer, Mathias S., Chatterjee, Shubhayu, Sachdev, Subir, Georges, Antoine, Ferrero, Michel
Format Journal Article
LanguageEnglish
Published College Park American Physical Society 22.05.2018
Subjects
Antiferromagnetism
Condensed matter physics
Critical temperature
Cuprates
Current carriers
Electron states
Energy gap
Experiments
Fermi surfaces
Gauge theory
General Physics
High temperature superconductors
Mathematical models
Momentum
Numerical methods
Physics
Quantum entanglement
Quantum mechanics
Topology
Two dimensional models
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Summary:One of the distinctive features of hole-doped cuprate superconductors is the onset of a “pseudogap” below a temperatureT*. Recent experiments suggest that there may be a connection between the existence of the pseudogap and the topology of the Fermi surface. Here, we address this issue by studying the two-dimensional Hubbard model with two distinct numerical methods. We find that the pseudogap only exists when the Fermi surface is holelike and that, for a broad range of parameters, its opening is concomitant with a Fermi-surface topology change from electronlike to holelike. We identify a common link between these observations: The polelike feature of the electronic self-energy associated with the formation of the pseudogap is found to also control the degree of particle-hole asymmetry, and hence the Fermi-surface topology transition. We interpret our results in the framework of an SU(2) gauge theory of fluctuating antiferromagnetism. We show that a mean-field treatment of this theory in a metallic state with U(1) topological order provides an explanation of this polelike feature and a good description of our numerical results. We discuss the relevance of our results to experiments on cuprates.
ISSN:2160-3308
2160-3308
DOI:10.1103/PhysRevX.8.021048