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TT: Fachverband Tiefe Temperaturen
TT 6: Postersession Correlated Electrons: (General) Theory, Low-Dimensional Systems, Kondo Physics, Heavy Fermions, Quantum-Critical Phenomena
TT 6.42: Poster
Montag, 23. März 2009, 13:00–16:45, P1A
Variational local moment approach to Kondo effect in the multi-orbital Anderson impurity model — •Anna Kauch1 and Krzysztof Byczuk2 — 1Theoretical Physics III, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany — 2Institute of Theoretical Physics, Faculty of Physics, Warsaw University, Hoza 69, PL-00-681 Warszawa, Poland
The recently developed [1,2] variational local moment approach (VLMA) to the single impurity Anderson model is presented. We focus on the application of the method to the multi-orbital impurity model in various regions of parameters where different types of Kondo effects can occur. The application of VLMA to the multi-orbital Hubbard model as an impurity solver of the dynamical mean-field theory equations is also addressed.
The method is based on assuming the existence of local moments – following the single orbital local moment approach of D. Logan [3]. The values of the local moments are obtained within VLMA by minimizing the ground state energy of the system.
[1] A. Kauch and K. Byczuk, Physica B 378-380, 297 (2006).
[2] A. Kauch and K. Byczuk, Quantum Magnetism, Proceedings of the NATO Advanced Study Institute on Quantum Magnetism, Les Houches, France, pp. 85-95 (Springer, 2008).
[3] D. Logan and M.T. Glossop, J. Phys. Condens. Matter 12, 985 (2000).