Roles of zeros of the Green function in Fermi arc and non-Fermi liquid in the two-dimensional Hubbard model

Shiro Sakai, Yukitoshi Motome, Masatoshi Imada

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7 Citations (Scopus)

Abstract

We clarify effects of zeros of the Green function on a Fermi arc and on a non-Fermi liquid behavior in the two-dimensional Hubbard model by means of the cellular dynamical mean-field theory (CDMFT). We study in detail the state with a hole-pocket Fermi surface and zeros of the Green function, which was found for a slightly doped Mott insulator in an earlier CDMFT calculation [T.D. Stanescu, G. Kotliar, Phys. Rev. B 74 (2006) 125110; T.D. Stanescu, M. Civelli, K. Haule, G. Kotliar, Ann. Phys. (N.Y.) 321 (2006) 1682]. As thermal or other extrinsic scatterings of electrons broaden the zeros, regions around the zero surface gain an imaginary part of the self-energy, which strongly suppresses the spectral intensity, especially on the closer side of the hole pocket to the zero surface. Then the rest emerges as a Fermi arc. Quasiparticle weight becomes ill defined on the closer side of the Fermi pocket while it is well defined on the opposite side, which means that a differentiation of electrons occurs in the momentum space, indicating an emergence of a non-Fermi liquid phase.

Original languageEnglish
Pages (from-to)3183-3186
Number of pages4
JournalPhysica B: Condensed Matter
Volume404
Issue number19
DOIs
Publication statusPublished - 2009 Oct 15
Externally publishedYes

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Keywords

  • Cluster dynamical mean-field theory
  • Fermi arc
  • Zeros of the Green function

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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