Orbital-selective Mott transitions in the degenerate Hubbard model

Details Orbital-selective Mott transitions in the degenerate Hubbard model Orbital-selective Mott transitions in the degenerate Hubbard model

2004-01-13

arxiv.org/abs/cond-mat/0401223v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.92.216402

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$_{2-x}$Sr$_x$RuO$_4$.

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