Orbital-selective Mott transitions in two-band Hubbard models

Details Orbital-selective Mott transitions in two-band Hubbard models Orbital-selective Mott transitions in two-band Hubbard models

2006-09-29

arxiv.org/abs/cond-mat/0609758v1

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 4 figures, presented at ICM2006 and accepted for JMMM

Scientific paper

The anisotropic two-orbital Hubbard model is investigated at low temperatures using high-precision quantum Monte Carlo (QMC) simulations within dynamical mean-field theory (DMFT). We demonstrate that two distinct orbital-selective Mott transitions (OSMTs) occur for a bandwidth ratio of 2 even without spin-flip contributions to the Hund exchange, and we quantify numerical errors in earlier QMC data which had obscured the second transition. The limit of small inter-orbital coupling is introduced via a new generalized Hamiltonian and studied using QMC and Potthoff's self-energy functional method, yielding insight into the nature of the OSMTs and the non-Fermi-liquid OSM phase and opening the possibility for a new quantum-critical point.

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