Quantum Monte Carlo loop algorithm for thet−Jmodel

Beat Ammon, Hans Gerd Evertz, Naoki Kawashima, Matthias Troyer, Beat Frischmuth
1998 Physical Review B (Condensed Matter)  
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
more » ... chain, a frustrated Heisenberg chain, and t-J ladder models.
doi:10.1103/physrevb.58.4304 fatcat:eaqvlds53bafbk6vvy2tci2dzu