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 journalArticle

11 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

Fingerprint

Hubbard model
Fermions
two dimensional models
fermions
Mean field theory
Electrons
Electron transitions
Carrier concentration
energy
emerging
electron scattering
electrons
insulators
low frequencies
electronics
excitation
Temperature
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Hidden-fermion representation of self-energy in pseudogap and superconducting states of the two-dimensional Hubbard model. / Sakai, Shiro; Civelli, Marcello; Imada, Masatoshi.

In: Physical Review B, Vol. 94, No. 11, 115130, 13.09.2016.

Research output: Contribution to journalArticle

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