Pseudogap and Fermi-Surface Topology in the Two-Dimensional Hubbard Model - Archive ouverte HAL
Article Dans Une Revue Physical Review X Année : 2018

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

Résumé

One of the distinctive features of hole-doped cuprate superconductors is the onset of a “pseudogap” below a temperature T*. 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.

Dates et versions

hal-01815131 , version 1 (13-06-2018)

Identifiants

Citer

Wei Wu, Mathias Scheurer, Shubhayu Chatterjee, Subir Sachdev, Antoine Georges, et al.. Pseudogap and Fermi-Surface Topology in the Two-Dimensional Hubbard Model. Physical Review X, 2018, 8 (2), pp.021048. ⟨10.1103/PhysRevX.8.021048⟩. ⟨hal-01815131⟩
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