Flow Equations and Normal Ordering. A Survey
统计力学
2009-11-11 v1 强关联电子
摘要
First we give an introduction to the method of diagonalizing or block-diagonalizing continuously a Hamiltonian and explain how this procedure can be used to analyze the two-dimensional Hubbard model. Then we give a short survey on applications of this flow equation on other models. Finally we outline, how symmetry breaking can be introduced by means of a symmetry breaking of the normal ordering, not of the Hamiltonian.
引用
@article{arxiv.cond-mat/0511660,
title = {Flow Equations and Normal Ordering. A Survey},
author = {Franz Wegner},
journal= {arXiv preprint arXiv:cond-mat/0511660},
year = {2009}
}
备注
11 pages, contribution to the workshop on the Renormalization Group, Helsinki 2005