Pseudogap and Fermi surface topology in the two-dimensional Hubbard model
Abstract
One of the distinctive features of hole-doped cuprate superconductors is the onset of a `pseudogap' below a temperature . 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 hole-like and that, for a broad range of parameters, its opening is concomitant with a Fermi surface topology change from electron- to hole-like. We identify a common link between these observations: the pole-like 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 pole-like feature, and a good description of our numerical results. We discuss the relevance of our results to experiments on cuprates.
Keywords
Cite
@article{arxiv.1707.06602,
title = {Pseudogap and Fermi surface topology in the two-dimensional Hubbard model},
author = {Wei Wu and Mathias S. Scheurer and Shubhayu Chatterjee and Subir Sachdev and Antoine Georges and Michel Ferrero},
journal= {arXiv preprint arXiv:1707.06602},
year = {2018}
}
Comments
16 pages, 14 figures