Orbital-selective Mott Transitions in a Doped Two-band Hubbard Model

Abstract

We extend previous studies on orbital-selective Mott transitions in the paramagnetic state of the half-filled degenerate two-band Hubbard model to the general doped case, using a high-precision quantum Monte Carlo dynamical mean-field theory solver. For sufficiently strong interactions, orbital-selective Mott transitions as a function of total band filling are clearly visible in the band-specific fillings, quasiparticle weights, double occupancies, and spectra. The results are contrasted with those of single-band models for similar correlation strengths.

12 pages, 12 figures

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• Emergence of a common energy scale close to the orbital-selective Mott transition
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• A General Mechanism for Orbital Selective Phase Transitions
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• Distinct Nature of Orbital Selective Mott Phases Dominated by the Low-energy Local Spin Fluctuations
• Magnetic transitions in strong coupling expansions for nearly degenerate states
• Deciding the fate of the false Mott transition in two dimensions by exact quantum Monte Carlo methods
• Mott transition, magnetic and orbital orders in the ground state of the two-band Hubbard model using variational slave-spin mean field formalism
• Comparison of computer-algebra strong-coupling perturbation theory and dynamical mean-field theory for the Mott-Hubbard insulator in high dimensions