title: Quantification of correlations in quantum many-particle systems.
abstract: We introduce a well-defined and unbiased measure of the strength of correlations in quantum many-particle systems which is based on the relative von Neumann entropy computed from the density operator of correlated and uncorrelated states. The usefulness of this general concept is demonstrated by quantifying correlations of interacting electrons in the Hubbard model and in a series of transition-metal oxides using dynamical mean-field theory.
authors.affiliation: Physics Faculty, Institute of Theoretical Physics, University of Warsaw, Warszawa, Poland.
authors.forename: Krzysztof
authors.initials: K
authors.lastname: Byczuk
authors.forename: Jan
authors.initials: J
authors.lastname: Kuneš
authors.forename: Walter
authors.initials: W
authors.lastname: Hofstetter
authors.forename: Dieter
authors.initials: D
authors.lastname: Vollhardt