Mott transitions in the two-dimensional half-filled Hubbard model: Correlator projection method with projective dynamical mean-field approximation

Article

关键词: METAL-INSULATOR-TRANSITION;    QUASI-PARTICLE DISPERSION;    INFINITE DIMENSIONS;    ELECTRON-SYSTEMS;    SUPERCONDUCTORS;    LIMIT;   

DOI  :  10.1103/PhysRevB.67.161102

来源: SCIE

【 摘 要 】

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-T-c cuprates.

【 授权许可】

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