Orbital-selective Mott transitions in the degenerate Hubbard model

2004/01/13 by Akihisa Koga, Norio Kawakami, T. M. Rice +1 · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.92.216402

4 pages, 4 figures

arxiv created 2004/01/13 · arxiv updated 2009/12/01

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 quasi-particle 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, Ca_2-xSr_xRuO₄.

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