Density-Matrix Spectra of Solvable Fermionic Systems

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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.
12 pages and 9 figures

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Statistical Mechanics, Astrophysics, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/218515

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0103301
 http://arxiv.org/abs/cond-mat/0103301
 Phys.Rev.B64:064412,2001
 doi:10.1103/PhysRevB.64.064412

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arXiv