Density-matrix spectra of solvable fermionic systems
Ming-Chiang ChungFachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, GermanyIngo PeschelFachbereich Physik, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
2001en
ABI
Abstract
We consider noninteracting 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 density-matrix renormalization group 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.
Identifiers
Citations and references
Cited by 20 references