Density-Matrix Spectra of Solvable Fermionic Systems
Statistical Mechanics
2009-02-05 v3 Astrophysics
Strongly Correlated Electrons
Abstract
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.
Keywords
Cite
@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}
}
Comments
12 pages and 9 figures