%0 Journal Article
%T Density Matrix and Renormalization for Classical Lattice Models
%A T. Nishino
%A K. Okunishi
%J Physics
%D 1996
%I arXiv
%R 10.1007/BFb0104638
%X We review the variational principle in the density matrix renormalization group (DMRG) method, which maximizes an approximate partition function within a restricted degrees of freedom; at zero temperature, DMRG mini- mizes the ground state energy. The variational principle is applied to two-dimensional (2D) classical lattice models, where the density matrix is expressed as a product of corner transfer matrices. (CTMs) DMRG related fields and future directions of DMRG are briefly discussed.
%U http://arxiv.org/abs/cond-mat/9610107v1