Possibility of Gapless Spin Liquid State by One-Dimensionalization(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Motivated by the observation of a gapless spin liquid state in κ-(BEDT-TTF)_2Cu_2(CN)_3, we analyze the anisotropic triangular lattice S=1/2 Heisenberg model with the resonating valence bond mean-field approximation. Paying attention to the small quasi-one-dimensional anisotropy of the material, we take an approach from one-dimensional (1D) chains coupled with frustrating zigzag bonds. By calculating one-particle excitation spectra changing anisotropy parameter J'/J from the decoupled 1D chains to the isotropic triangular lattice, we find almost gapless excitations in the wide range from the 1D limit. This one-dimensionalization by frustration is considered to be a candidate for the mechanism of the gapless spin liquid state.
- 社団法人日本物理学会の論文
- 2007-05-15
著者
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OGATA Masao
Department of Physics, University of Tokyo
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Hayashi Yuta
Department Of Physics University Of Tokyo
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo
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