Possibility of Gapless Spin Liquid State by One-dimensionalization

Details Possibility of Gapless Spin Liquid State by One-dimensionalization Possibility of Gapless Spin Liquid State by One-dimensionalization

2007-04-03

arxiv.org/abs/0704.0313v1

J.Phys.Soc.Jpn. 76 (2007) 053705.

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures(downsized), To appear in J. Phys. Soc. Jpn.

Scientific paper

10.1143/JPSJ.76.053705

Motivated by the observation of a gapless spin liquid state in $\kappa$-(BEDT-TTF)$_2$Cu$_2$(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 zig-zag 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.

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