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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.59: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Local moment approach as an impurity solver of multi-orbital dynamical mean-field theory for correlated electrons — Anna Kauch¹ and •Krzysztof Byczuk^2,1 — ¹Institute of Theoretical Physics, Warsaw University, ul. Hoza 69, PL-00-681 Warszawa, Poland — ²Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute for Physics, University of Augsburg, D-86135 Augsburg, Germany

A modified local moment approach is developed, and is applied as an impurity solver of the dynamical mean-field equations for the multiorbital Hubbard model. Assuming the existence of local moments their values are determined through a variational principle by minimizing the corresponding ground state energy. The method is applied to study the Mott metal-insulator transition in the multi-orbital Hubbard model.

[1] A. Kauch and K. Byczuk, Physica B 378-380, 297 (2006). [2] A. Kauch and K. Byczuk, Proceedings of Leschouches summer school, to be published (2007). [3] D. Logan, M.P. Eastwood and M.A. Tusch, J. Phys. Cond. Matter 10, 2673 (1998).