A slave-boson mean-field theory for general multi-band Hubbard models

Details A slave-boson mean-field theory for general multi-band Hubbard models A slave-boson mean-field theory for general multi-band Hubbard models

2010-02-17

arxiv.org/abs/1002.3228v2

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages, accepted for publication in Phys. Status Solidi B

Scientific paper

We introduce a new slave-boson mean-field theory which allows the investigation of general multi-band Hubbard models. Unlike earlier attempts of such a generalisation, in our approach the quantum-mechanical problem is exactly reformulated in an extended Hilbert space of Fermions and Bosons before a mean-field approximation is applied. Systems with superconducting order parameters are naturally included in our formalism. Our ground-state energy functional agrees with the corresponding quantity derived within the Gutzwiller theory.

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