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The European Physical Journal B
ISSN: 1434-6028 (printed version)
ISSN: 1434-6036 (electronic version)
Abstract Volume 4 Issue 1 (1998) pp 29-38
The Gutzwiller approximation for degenerate bands: a formal derivation
J. Bünemann (a)
Inst. f. Physik, Universität Dortmund, 44221 Dortmund, Germany
Received: 9 December 1997 / Revised and accepted: 6 March 1998
Abstract: We present a detailed derivation of the Gutzwiller approximation for multi-band Hubbard models with density-density Coulomb interactions. For the one-band Hubbard model we introduce a mathematically well-defined formalism which is easily generalized to the multi-band case. In contrast to earlier attempts, our approach allows us to include inter-orbital hopping terms in the Hamiltonian.
PACS. 71.10.Fd Lattice fermion models (Hubbard model, etc.) - 71.27.+a Strongly correlated electron systems; heavy fermions
(a) email: bueneman@grad.physik.uni-dortmund.de
Article in PDF-Format (311 KB)
Online publication: July 27, 1998
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