Hidden-fermion representation of self-energy in pseudogap and superconducting states of the two-dimensional Hubbard model

Shiro Sakai, Marcello Civelli, Masatoshi Imada

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

We study the frequency-dependent structure of electronic self-energy in the pseudogap and superconducting states of the two-dimensional Hubbard model. We present the self-energy calculated with the cellular dynamical mean-field theory systematically in the space of temperature, electron density, and interaction strength. We show that the low-frequency part of the self-energy is well represented by a simple equation, which describes the transitions of an electron to and from a hidden-fermionic state. By fitting the numerical data with this simple equation, we determine the parameters characterizing the hidden fermion and discuss its identity. The simple expression of the self-energy offers a way to organize numerical data of these uncomprehended superconducting and pseudogap states, as well as a useful tool to analyze spectroscopic experimental results. The successful description by the simple two-component fermion model supports the idea of "dark" and "bright" fermions emerging from a bare electron as bistable excitations in doped Mott insulators.

Original languageEnglish
Article number115130
JournalPhysical Review B
Volume94
Issue number11
DOIs
Publication statusPublished - 2016 Sep 13
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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