Effects of off-site Coulomb interaction in a Hubbard model on a triangular lattice

Tsutomu Watanabe; Hisatoshi Yokoyama; Yukio Tanaka; Jun ichiro Inoue

doi:10.1016/j.jpcs.2008.06.089

Effects of off-site Coulomb interaction in a Hubbard model on a triangular lattice

Tsutomu Watanabe, Hisatoshi Yokoyama, Yukio Tanaka, Jun ichiro Inoue

SCI - Physics

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

Half-filled-band extended Hubbard models on anisotropic triangular lattices are studied using a variational Monte Carlo method, with κ-(BEDT-TTF)₂X in mind. Mott transitions are always observed at certain U. For the isotropic case, an antiferromagnetic (AF) order with 120° spin structure becomes dominant in the insulating regime. Introduction of intersite Coulomb interaction (V) only slightly affects the AF order, but a threefold charge order appears when V / U ≳ frac(1, 3). As for superconductivity, d₂-, d_xy-, and f₂-wave pairing states, which form pairs on next-nearest-neighbor sites, are stabilized with respect to the normal state for large V.

Original language	English
Pages (from-to)	3372-3374
Number of pages	3
Journal	Journal of Physics and Chemistry of Solids
Volume	69
Issue number	12
DOIs	https://doi.org/10.1016/j.jpcs.2008.06.089
Publication status	Published - 2008 Dec 1

Keywords

A. Organic compounds
A. Superconductors
D. Electrical properties
D. Magnetic properties
D. Superconductivity

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)
Condensed Matter Physics

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title = "Effects of off-site Coulomb interaction in a Hubbard model on a triangular lattice",

abstract = "Half-filled-band extended Hubbard models on anisotropic triangular lattices are studied using a variational Monte Carlo method, with κ-(BEDT-TTF)2X in mind. Mott transitions are always observed at certain U. For the isotropic case, an antiferromagnetic (AF) order with 120° spin structure becomes dominant in the insulating regime. Introduction of intersite Coulomb interaction (V) only slightly affects the AF order, but a threefold charge order appears when V / U ≳ frac(1, 3). As for superconductivity, d2-, dxy-, and f2-wave pairing states, which form pairs on next-nearest-neighbor sites, are stabilized with respect to the normal state for large V.",

keywords = "A. Organic compounds, A. Superconductors, D. Electrical properties, D. Magnetic properties, D. Superconductivity",

author = "Tsutomu Watanabe and Hisatoshi Yokoyama and Yukio Tanaka and Inoue, {Jun ichiro}",

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AU - Watanabe, Tsutomu

AU - Yokoyama, Hisatoshi

AU - Tanaka, Yukio

AU - Inoue, Jun ichiro

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N2 - Half-filled-band extended Hubbard models on anisotropic triangular lattices are studied using a variational Monte Carlo method, with κ-(BEDT-TTF)2X in mind. Mott transitions are always observed at certain U. For the isotropic case, an antiferromagnetic (AF) order with 120° spin structure becomes dominant in the insulating regime. Introduction of intersite Coulomb interaction (V) only slightly affects the AF order, but a threefold charge order appears when V / U ≳ frac(1, 3). As for superconductivity, d2-, dxy-, and f2-wave pairing states, which form pairs on next-nearest-neighbor sites, are stabilized with respect to the normal state for large V.

AB - Half-filled-band extended Hubbard models on anisotropic triangular lattices are studied using a variational Monte Carlo method, with κ-(BEDT-TTF)2X in mind. Mott transitions are always observed at certain U. For the isotropic case, an antiferromagnetic (AF) order with 120° spin structure becomes dominant in the insulating regime. Introduction of intersite Coulomb interaction (V) only slightly affects the AF order, but a threefold charge order appears when V / U ≳ frac(1, 3). As for superconductivity, d2-, dxy-, and f2-wave pairing states, which form pairs on next-nearest-neighbor sites, are stabilized with respect to the normal state for large V.

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