Journal
PHYSICA B-CONDENSED MATTER
Volume 407, Issue 2, Pages 209-217Publisher
ELSEVIER
DOI: 10.1016/j.physb.2011.10.030
Keywords
Kondo effect; Hubbard model; Metal-insulator transitions
Categories
Funding
- Deutsche Forschungsgemeinschaft [SFB 484, TRR 80]
- Polish Ministry of Science and Education [N202026 32/0705]
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The variational local moment approach (VLMA) solution of the single impurity Anderson model is presented. It generalizes the local moment approach of Logan et al. by invoking the variational principle to determine the lengths of local moments and orbital occupancies. We show that VLMA is a comprehensive, conserving and thermodynamically consistent approximation and treats both Fermi and non-Fermi liquid regimes as well as local moment phases on equal footing. We tested VLMA on selected problems. We solved the single- and multi-orbital impurity Anderson model in various regions of parameters, where different types of Kondo effects occur. The application of VLMA as an impurity solver of the dynamical mean-field theory, used to solve the multi-orbital Hubbard model, is also addressed. (C) 2011 Elsevier B.V. All rights reserved.
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