Deconfined criticality for the S=1 spin model on the spatially anisotropic triangular lattice

作者：Nishiyama Yoshihiro^*

来源：Physical Review B, 2011, 83(5): 054417.

DOI：10.1103/PhysRevB.83.054417

The quantum S = 1 spin model on the spatially anisotropic triangular lattice is investigated numerically. The nematic and valence-bond-solid (VBS) phases are realized by adjusting the spatial anisotropy and the biquadratic interaction. The phase transition between the nematic and VBS phases is expected to be a continuous one with unconventional critical indices (deconfined criticality). The geometrical character (spatial anisotropy) is taken into account by imposing the screw-boundary condition (Novotny's method). Diagonalizing the finite-size cluster with N <= 20 spins, we observe a clear indication of continuous phase transition. The correlation-length critical exponent is estimated as nu = 0.92(10).

• 出版日期2011-2-15