Mott transitions in two-orbital Hubbard systems

Details Mott transitions in two-orbital Hubbard systems Mott transitions in two-orbital Hubbard systems

2005-10-17

arxiv.org/abs/cond-mat/0510449v1

Physics

Condensed Matter

Strongly Correlated Electrons

21 Pages, 17 Figures, to appear in Progress of Theoretical Physics (YKIS2004 Proceedings)

Scientific paper

10.1143/PTPS.160.253

We investigate the Mott transitions in two-orbital Hubbard systems. Applying the dynamical mean field theory and the self-energy functional approach, we discuss the stability of itinerant quasi-particle states in each band. It is shown that separate Mott transitions occur at different Coulomb interaction strengths in general. On the other hand, if some special conditions are satisfied for the interactions, spin and orbital fluctuations are equally enhanced at low temperatures, resulting in a single Mott transition. The phase diagrams are obtained at zero and finite temperatures. We also address the effect of the hybridization between two orbitals, which induces the Kondo-like heavy fermion states in the intermediate orbital-selective Mott phase.

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