Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 40: Poster Session Correlated Electrons
TT 40.76: Poster
Mittwoch, 13. März 2013, 15:00–19:00, Poster D
Quantification of correlations in an exactly solvable model of harmonically interacting particles — Jan Skolimowski1, •Krzysztof Byczuk1, and Dieter Vollhardt2 — 1Faculty of Physics, University of Warsaw, Hoza 69, 00-681 Wrszawa, Poland — 2Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, 86135 Augsburg, Germany
We employ the relative von Neumann entropy to quantify correlations in a system of interacting particles. The interaction between the particles is harmonic potential-like, making the model exactly solvable. The exact expression for the relative entropy is expanded in the coupling constant, which allows us to classify the different contributions to correlations in terms of Feynman diagrams or correlation functions.