Exact diagonalization study on the extended Hubbard model in an anisotropic triangular lattice

被引：1

作者：

Kanada, Ken ^{[1
]}

Watanabe, Tsutomu ^{[1
]}

Onari, Seiichiro ^{[1
]}

Tanaka, Yukio ^{[1
]}

机构：

[1] Nagoya Univ, Dept Appl Phys, Nagoya, Aichi 4648603, Japan

来源：

JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS | 2008年 / 69卷 / 12期

基金：

美国国家航空航天局;

关键词：

Organic compounds; Charge-density waves; Spin-density waves;

D O I：

10.1016/j.jpcs.2008.06.083

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

A half-filled-band extended Hubbard model on an anisotropic triangular lattice is studied, using an exact diagonalization method, with kappa-(BEDT-TTF)(2)X in mind. In the isotropic case, the charge fluctuation of (27 pi/3, 2 pi/3) is enhanced by the introduction of off-site Coulomb interaction (V). In the case of V = 0, the anti ferromagnetic (AF) fluctuation is sizable for small frustration. However, when V is introduced, the AF fluctuation is rapidly suppressed and becomes substantially small, irrespective of the strength of frustration. Thus, it is revealed that both spin and charge fluctuations are sensitive to the shifts of t'/t and V/t. (C) 2008 Published by Elsevier Ltd.

引用

页码：3334 / 3336

页数：3

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