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

Ken Kanada; Tsutomu Watanabe; Seiichiro Onari; Yukio Tanaka

doi:10.1016/j.jpcs.2008.06.083

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

Ken Kanada, Tsutomu Watanabe, Seiichiro Onari, Yukio Tanaka

Graduate School of Natural Science and Technology

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

1 Citation (Scopus)

Abstract

A half-filled-band extended Hubbard model on an anisotropic triangular lattice is studied, using an exact diagonalization method, with κ-(BEDT-TTF)₂X in mind. In the isotropic case, the charge fluctuation of (2 π / 3, 2 π / 3) is enhanced by the introduction of off-site Coulomb interaction (V). In the case of V = 0, the antiferromagnetic (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.

Original language	English
Pages (from-to)	3334-3336
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.2008.06.083
Publication status	Published - Dec 1 2008

Keywords

A. Organic compounds
D. Charge-density waves
D. Spin-density waves

ASJC Scopus subject areas

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

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abstract = "A half-filled-band extended Hubbard model on an anisotropic triangular lattice is studied, using an exact diagonalization method, with κ-(BEDT-TTF)2X in mind. In the isotropic case, the charge fluctuation of (2 π / 3, 2 π / 3) is enhanced by the introduction of off-site Coulomb interaction (V). In the case of V = 0, the antiferromagnetic (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.",

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AU - Kanada, Ken

AU - Watanabe, Tsutomu

AU - Onari, Seiichiro

AU - Tanaka, Yukio

PY - 2008/12/1

Y1 - 2008/12/1

N2 - A half-filled-band extended Hubbard model on an anisotropic triangular lattice is studied, using an exact diagonalization method, with κ-(BEDT-TTF)2X in mind. In the isotropic case, the charge fluctuation of (2 π / 3, 2 π / 3) is enhanced by the introduction of off-site Coulomb interaction (V). In the case of V = 0, the antiferromagnetic (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.

AB - A half-filled-band extended Hubbard model on an anisotropic triangular lattice is studied, using an exact diagonalization method, with κ-(BEDT-TTF)2X in mind. In the isotropic case, the charge fluctuation of (2 π / 3, 2 π / 3) is enhanced by the introduction of off-site Coulomb interaction (V). In the case of V = 0, the antiferromagnetic (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.

KW - A. Organic compounds

KW - D. Charge-density waves

KW - D. Spin-density waves

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