Density-Matrix Spectra of Solvable Fermionic Systems
统计力学
2009-02-05 v3 天体物理学
强关联电子
摘要
We consider non-interacting fermions on a lattice and give a general result for the reduced density matrices corresponding to parts of the system. This allows to calculate their spectra, which are essential in the DMRG method, by diagonalizing small matrices. We discuss these spectra and their typical features for various fermionic quantum chains and for the two-dimensional tight-binding model.
关键词
引用
@article{arxiv.cond-mat/0103301,
title = {Density-Matrix Spectra of Solvable Fermionic Systems},
author = {Ming-Chiang Chung and Ingo Peschel},
journal= {arXiv preprint arXiv:cond-mat/0103301},
year = {2009}
}
备注
12 pages and 9 figures