Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 23: Correlated Electrons: (General) Theory
TT 23.14: Vortrag
Mittwoch, 27. Februar 2008, 17:45–18:00, H 0104
Rotationally invariant slave-boson formalism and momentum dependence of the quasiparticle weight — •Frank Lechermann1, Antoine Georges2, Gabriel Kotliar3, and Olivier Parcollet4 — 1I. Institut für Theoretische Physik, Universität Hamburg, Germany — 2CPHT, École Polytechnique, Palaiseau, France — 3Serin Physics Laboratories, Rutgers University, NJ, USA — 4Service de Physique Théorique, CEA Saclay, Gif-Sur-Yvette, France
The rotationally invariant formulation of the slave-boson formalism is generalized to multiorbital models, with arbitrary interactions, crystal fields, and multiplet structure [1]. This allows for the study of multiplet effects on the nature of low-energy quasiparticles. Nondiagonal components of the matrix of quasiparticle weights can be calculated within this framework. When combined with cluster extensions of dynamical mean-field theory, this method renders it possible to address the effects of spatial correlations, such as the generation of the superexchange and the momentum dependence of the quasiparticle weight. The method is illustrated on several examples, including a two-dimensional single-band Hubbard model (within a two-site cellular dynamical mean-field approximation).
[1] F. Lechermann, A. Georges, G. Kotliar, and O. Parcollet, PRB 76 155102 (2007).