Effects of degenerate orbitals on the Hubbard model

Abstract

Stability of a metallic state in the two-orbital Hubbard model at half-filling is investigated. We clarify how spin and orbital fluctuations are enhanced to stabilize the formation of quasi-particles by combining dynamical mean field theory with the quantum Monte Carlo simulations. These analyses shed some light on the reason why the metallic phase is particularly stable when the intra- and inter-band Coulomb interactions are nearly equal.

3 pages, To appear in JPSJ Vol. 72, No. 5 2003

References in corpus (3)

• Coexistence of magnetism and superconductivity in CeRh1-xIrxIn5
• Mott transitions in correlated electron systems with orbital degrees of freedom
• Stability of a metallic state in the two-orbital Hubbard model

Cited by in corpus (15)

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• Spin, charge and orbital fluctuations in a multi-orbital Mott insulator
• Finite-temperature Mott transitions in multi-orbital Hubbard model
• Field-induced phase transitions in a Kondo insulator
• Superconductivity in the two-band Hubbard model
• Mott transitions in the multi-orbital systems
• Quantum phase transitions in the extended periodic Anderson model
• Phase diagram of orbital-selective Mott transitions at finite temperatures
• Finite Temperature Phase Transitions in the SU$(N)$ Hubbard model
• Periodic Anderson model with degenerate orbitals: linearized dynamical mean field theory approach
• Spontaneously orbital-selective superconductivity in a three-orbital Hubbard model
• Staggered ordered phases in the three-orbital Hubbard model
• Magnetic properties of a Kondo insulator with RKKY interaction: Extended dynamical mean field study
• Symmetry breaking states in the half-filled two-orbital Hubbard model with crystalline electric field