期刊
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN
卷 71, 期 9, 页码 2109-2112出版社
PHYSICAL SOC JAPAN
DOI: 10.1143/JPSJ.71.2109
关键词
Mott transition; nonmagnetic insulator; antiferromagnetic transition; Mott insulator; bandwidth control; triangular lattice; BEDT-TTF compounds
We study phase diagrams of the Hubbard model on anisotropic triangular lattices, which also represents a model for kappa-type BEDT-TTF compounds. In contrast with mean-field predictions, path-integral renormalization group calculations show a universal presence of a nonmagnetic insulator sandwiched by an antiferromagnetic insulator and paramagnetic metals. The nonmagnetic phase does not show simple translational symmetry breakings such as flux phases, implying a genuine Mott insulator. We discuss possible relevance to the nonmagnetic insulating phase found in kappa-(ET)(2)Cu-2(CN)(3).
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