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Geometrical-frustration-induced (Semi)metal-to-insulator transition.

作者信息

Fujimoto Satoshi

机构信息

Department of Physics, Kyoto University, Japan.

出版信息

Phys Rev Lett. 2002 Nov 25;89(22):226402. doi: 10.1103/PhysRevLett.89.226402. Epub 2002 Nov 7.

DOI:10.1103/PhysRevLett.89.226402
PMID:12485086
Abstract

We study the low-energy properties of the geometrically frustrated Hubbard model on a three-dimensional pyrochlore lattice and a two-dimensional checkerboard lattice on the basis of the renormalization group method and mean field analysis. It is found that, in the half-filling case, a (semi)metal to insulator transition (MIT) occurs. Also, in the insulating phase, which has a spin gap, the spin rotational symmetry is not broken, while charge ordering exists. The results are applied to the description of the MIT observed in the pyrochlore system Tl2Ru2O7.

摘要

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