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

Abstract

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.

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

References in corpus (4)

• Rotationally-invariant slave-boson formalism and momentum dependence of the quasiparticle weight
• Equivalence of Gutzwiller and slave-boson mean-field theories for multi-band Hubbard models
• Rotationally-invariant slave-bosons for Strongly Correlated Superconductors
• Gutzwiller variational theory for the Hubbard model with attractive interaction

Cited by in corpus (7)

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• Coexistence of spin-triplet superconductivity with magnetism within a single mechanism for orbitally degenerate correlated electrons: Statistically-consistent Gutzwiller approximation
• Generalized slave-particle method for extended Hubbard models
• Rigorous symmetry adaptation of multiorbital rotationally invariant slave-boson theory with application to Hund's rules physics
• Numerical minimisation of Gutzwiller energy functionals
• Low quasiparticle coherence temperature in the one band-Hubbard model: A slave-boson approach
• Symmetry Breaking in Occupation Number Based Slave-Particle Methods