Mott transitions in the two-dimensional half-filled Hubbard model

Correlator projection method with projective dynamical mean-field approximation

Shigeki Onoda, Masatoshi Imada

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41 Citations (Scopus)

Abstract

The two-dimensional half-filled Hubbard model is studied by a nonperturbative analytic theory of correlator projection. The dynamical mean-field approximation (DMFA) is reproduced at the first-order projection and then improved by systematic inclusion of spatial correlations at higher orders. A geometrical frustration induces a first-order Mott transition surface with a finite-temperature critical end curve and related crossovers. Growth of antiferromagnetic correlations gives single-particle spectra strongly modified from DMFA with shadow bands and flat dispersions observed in high-(formula presented) cuprates.

Original languageEnglish
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number16
DOIs
Publication statusPublished - 2003 Apr 8
Externally publishedYes

Fingerprint

Hubbard model
Correlators
correlators
Dispersions
projection
frustration
approximation
cuprates
critical temperature
crossovers
inclusions
Temperature
curves

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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AB - The two-dimensional half-filled Hubbard model is studied by a nonperturbative analytic theory of correlator projection. The dynamical mean-field approximation (DMFA) is reproduced at the first-order projection and then improved by systematic inclusion of spatial correlations at higher orders. A geometrical frustration induces a first-order Mott transition surface with a finite-temperature critical end curve and related crossovers. Growth of antiferromagnetic correlations gives single-particle spectra strongly modified from DMFA with shadow bands and flat dispersions observed in high-(formula presented) cuprates.

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