Dominant antiferromagnetism in the Hubbard model on anisotropic triangular lattices

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

doi:10.1016/j.jmmm.2006.10.106

Dominant antiferromagnetism in the Hubbard model on anisotropic triangular lattices

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

SCI - Physics

Research output: Contribution to journal › Article

5 Citations (Scopus)

Abstract

With κ - (BEDT - TTF)₂ X in mind, we study a half-filled-band Hubbard model on an anisotropic triangular lattice, using an optimization variational Monte Carlo method. As a trial function, we use a state having antiferromagnetic (AF) and d-wave singlet gaps simultaneously, and allow for a band renormalization effect in it. It is found that, at a fairy small value of U / t, a first-order conductor-to-AF insulator transition takes place even for remarkably large strength of frustration. In the optimized insulating states, the staggered magnetization is always robust, even for fully frustrated case. Thereby, a regime of robust superconductor as well as of a nonmagnetic insulator vanishes in this wave function.

Original language	English
Pages (from-to)	648-650
Number of pages	3
Journal	Journal of Magnetism and Magnetic Materials
Volume	310
Issue number	2 SUPPL. PART 1
DOIs	https://doi.org/10.1016/j.jmmm.2006.10.106
Publication status	Published - 2007 Mar 1

Keywords

Anisotropic triangular lattice
Hubbard model
Mott transition

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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Watanabe, T., Yokoyama, H., Tanaka, Y., & Inoue, J. I. (2007). Dominant antiferromagnetism in the Hubbard model on anisotropic triangular lattices. Journal of Magnetism and Magnetic Materials, 310(2 SUPPL. PART 1), 648-650. https://doi.org/10.1016/j.jmmm.2006.10.106

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abstract = "With κ - (BEDT - TTF)2 X in mind, we study a half-filled-band Hubbard model on an anisotropic triangular lattice, using an optimization variational Monte Carlo method. As a trial function, we use a state having antiferromagnetic (AF) and d-wave singlet gaps simultaneously, and allow for a band renormalization effect in it. It is found that, at a fairy small value of U / t, a first-order conductor-to-AF insulator transition takes place even for remarkably large strength of frustration. In the optimized insulating states, the staggered magnetization is always robust, even for fully frustrated case. Thereby, a regime of robust superconductor as well as of a nonmagnetic insulator vanishes in this wave function.",

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AU - Watanabe, Tsutomu

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N2 - With κ - (BEDT - TTF)2 X in mind, we study a half-filled-band Hubbard model on an anisotropic triangular lattice, using an optimization variational Monte Carlo method. As a trial function, we use a state having antiferromagnetic (AF) and d-wave singlet gaps simultaneously, and allow for a band renormalization effect in it. It is found that, at a fairy small value of U / t, a first-order conductor-to-AF insulator transition takes place even for remarkably large strength of frustration. In the optimized insulating states, the staggered magnetization is always robust, even for fully frustrated case. Thereby, a regime of robust superconductor as well as of a nonmagnetic insulator vanishes in this wave function.

AB - With κ - (BEDT - TTF)2 X in mind, we study a half-filled-band Hubbard model on an anisotropic triangular lattice, using an optimization variational Monte Carlo method. As a trial function, we use a state having antiferromagnetic (AF) and d-wave singlet gaps simultaneously, and allow for a band renormalization effect in it. It is found that, at a fairy small value of U / t, a first-order conductor-to-AF insulator transition takes place even for remarkably large strength of frustration. In the optimized insulating states, the staggered magnetization is always robust, even for fully frustrated case. Thereby, a regime of robust superconductor as well as of a nonmagnetic insulator vanishes in this wave function.

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