Abstract

We investigate ground state properties of triangular lattice spin-1/2 systems with one-dimensional (1D) anisotropy by use of variational Monte Carlo method. Using resonating-valence-bond (RVB) state as a trial wave-function, we focus on the optimization of the complex pairing function Δ ij ≡ 〈 c i ↑ c j ↓ 〉 and compare the results to those of our previous RVB mean-field analysis. As the anisotropy parameter ( J ′ / J ) deviates from unity, strong “one-dimensionalization” is found in the pairing function and strong suppression of “spin-gap” can be expected even near the isotropic point ( J ′ / J = 1 ). Implications for recent experiments on spin liquid states with anomalously small spin-gap, found in organic conductors κ ‐ ( ET ) 2 Cu 2 ( CN ) 3 , is discussed.

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