Quantum Monte Carlo Loop Algorithm for the t-J Model
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We propose a generalization of the Quantum Monte Carlo loop algorithm to the t-J model by a mapping to three coupled six-vertex models. The autocorrelation times are reduced by orders of magnitude compared to the conventional local algorithms. The method is completely ergodic and can be formulated directly in continuous time. We introduce improved estimators for simulations with a local sign problem. Some first results of finite temperature simulations are presented for a t-J chain, a frustrated Heisenberg chain, and t-J ladder models.
22 pages, including 12 figures. RevTex v3.0, uses psf.tex
22 pages, including 12 figures. RevTex v3.0, uses psf.tex