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Gutzwiller variational wave function for multi-orbital Hubbard models in finite dimensions

Published 27 Oct 2015 in cond-mat.str-el | (1510.07896v1)

Abstract: We develop a diagrammatic method for the evaluation of general multi-band Gutzwiller wave functions in finite dimensions. Our approach provides a systematic improvement of the widely used Gutzwiller approximation. As a first application we investigate itinerant ferromagnetism and correlation-induced deformations of the Fermi surface for a two-band Hubbard model on a square lattice.

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