Fast impurity solver for dynamical mean field theory based on second order perturbation around the atomic limit  

作　　者：庄嘉宁 刘青梅 方忠 戴希 

机构地区：[1]Institute of Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics B》2010年第8期535-542,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(Grant Nos.10334090,10425418,60576058);the National Basic Research Program of China(Grant No.2007CB925000)

摘　　要：This paper proposes an impurity solver for the dynamical mean field theory （DMFT） study of the Mott insulators, which is based on the second order perturbation of the hybridization function. After careful benchmarking with quantum Monte Carlo results on the anti-ferromagnetic phase of the Hubbard model, it concludes that this impurity solver can capture the main physical features in the strong coupling regime and can be a very useful tool for the LDA （local density approximation） ＋ DMFT studies of the Mort insulators with long range order.This paper proposes an impurity solver for the dynamical mean field theory （DMFT） study of the Mott insulators, which is based on the second order perturbation of the hybridization function. After careful benchmarking with quantum Monte Carlo results on the anti-ferromagnetic phase of the Hubbard model, it concludes that this impurity solver can capture the main physical features in the strong coupling regime and can be a very useful tool for the LDA （local density approximation） ＋ DMFT studies of the Mort insulators with long range order.

关 键 词：dynamical mean field theory impurity solver Mott insulator antiferromagnetic order 

分 类 号：O469[理学—凝聚态物理]