Pseudogap and Fermi surface topology in the two-dimensional Hubbard model.

By Wéi Wú, M. Scheurer, S. Chatterjee, S. Sachdev, A. Georges, Michel Ferrero. 2017

135 citations recorded by the source corpus.

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 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.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials

View Paper: https://www.semanticscholar.org/paper/323c7de250644682968f9a9494885275569326cf

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In Condensed Matter Physics

  1. Olivier Parcollet
  2. Michel Ferrero
  3. Shiwei Zhang
  4. A. Georges
  5. S. Sachdev
  6. D. Stanford
  7. Alexei Y. Kitaev

In Electronic, Optical and Magnetic Materials

  1. Olivier Parcollet
  2. A. Georges

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