Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-06-27
Phys. Rev. B 67, R161102 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, including 6 figures, revisions including new figures
Scientific paper
10.1103/PhysRevB.67.161102
The 2D half-filled Hubbard model is studied by a nonperturbative analytic theory of correlator projection. The original 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. Growth of antiferromagnetic correlations gives single-particle spectra strongly modified from DMFA with shadow bands and flat dispersions observed in high-T_c cuprates.
Imada Masatoshi
Onoda Shigeki
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