Variational Monte Carlo studies of a t-J model on an anisotropic triangular lattice
Superconductivity
2009-11-10 v1 Strongly Correlated Electrons
Abstract
With the insulating phase of \kappa-(BEDT-TTF)_2X in mind, we study a t-J model on an anisotropic triangular lattice, where the hopping integral is t' in one of the three directions, using a variational Monte Carlo method. By changing the value of t'/t, we study the stability of superconducting (SC) states with d- and d+id-wave symmetries and of an antiferromagnetic (AF) state. As t'/t decreases from 1, the stable state immediately switches from the d+id wave to the d wave. The AF state is stabilized from the normal spin liquid state for t'/t\lsim 0.7 at half filling. We also take account of Nagaoka ferromagnetism and a phase separation.
Keywords
Cite
@article{arxiv.cond-mat/0411711,
title = {Variational Monte Carlo studies of a t-J model on an anisotropic triangular lattice},
author = {Tsutomu Watanabe and Hisatoshi Yokoyama and Yukio Tanaka and Jun-ichiro Inoue and Masao Ogata},
journal= {arXiv preprint arXiv:cond-mat/0411711},
year = {2009}
}
Comments
4 pages, 3 figures