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Orbital-selective mott transitions in the degenerate Hubbard model
Akihisa Koga1, Norio Kawakami, T M Rice
1Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan.
Abstract:
We investigate the Mott transitions in two-band Hubbard models with different bandwidths. Applying dynamical mean field theory, we discuss the stability of itinerant quasiparticle states in each band. We demonstrate that separate Mott transitions occur at different Coulomb interaction strengths in general, which merge to a single transition only under special conditions. This kind of behavior may be relevant for the physics of the single-layer ruthenates, Ca2-xSrxRuO4.
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