pseudogap and fermi-surface topology in the two-dimensional hubbard model
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ID: 196561
2018
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Abstract
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.
| Reference Key |
wu2018physicalpseudogap
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|---|---|
| Authors | ;Wei Wu;Mathias S. Scheurer;Shubhayu Chatterjee;Subir Sachdev;Antoine Georges;Michel Ferrero |
| Journal | american journal of transplantation |
| Year | 2018 |
| DOI |
10.1103/PhysRevX.8.021048
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| URL | |
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