Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures

Details Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures

2005-05-04

arxiv.org/abs/cond-mat/0505106v1

Phys. Rev. B 72, 081103(R) (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures

Scientific paper

10.1103/PhysRevB.72.081103

The anisotropic degenerate two-orbital Hubbard model is studied within dynamical mean-field theory at low temperatures. High-precision calculations on the basis of a refined quantum Monte Carlo (QMC) method reveal that two distinct orbital-selective Mott transitions occur for a bandwidth ratio of 2 even in the absence of spin-flip contributions to the Hund exchange. The second transition -- not seen in earlier studies using QMC, iterative perturbation theory, and exact diagonalization -- is clearly exposed in a low-frequency analysis of the self-energy and in local spectra.

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