Effects of degenerate orbitals on the Hubbard model
Akihisa Koga, Takuma Ohashi, Yoshiki Imai, Sei-ichiro Suga, Norio, Kawakami
TL;DR
This paper investigates how degenerate orbitals influence the stability of metallic states in the two-orbital Hubbard model, revealing the role of spin and orbital fluctuations in stabilizing quasi-particles.
Contribution
It combines dynamical mean field theory with quantum Monte Carlo simulations to clarify the stabilization mechanism of metallic phases when intra- and inter-band Coulomb interactions are similar.
Findings
Enhanced spin and orbital fluctuations stabilize quasi-particles.
Metallic phase stability is maximized when intra- and inter-band Coulomb interactions are nearly equal.
The study provides insight into orbital effects on correlated electron systems.
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.
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