Mott transitions in the multi-orbital systems

Abstract

We investigate the Mott transitions in the two-orbital Hubbard model with different bandwidths. By combining dynamical mean field theory with the exact diagonalization, 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. In particular, it is clarified that the $xy$ and pair-hopping components of the Hund coupling play a key role to control the nature of the Mott transitions.

2 pages, 1 figure, submitted to SCES2004

References in corpus (3)

• Orbital-selective Mott transitions in the degenerate Hubbard model
• Orbital Dependent Phase Control in Ca2-xSrxRuO4
• Orbital and spin correlations in Ca${}_{2-x}$Sr${}_x$RuO${}_4$: A mean field study

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• Emergence of a common energy scale close to the orbital-selective Mott transition
• Orbital-selective Mott transitions in a doped two-band Hubbard model with crystal field splitting
• Phase diagram of orbital-selective Mott transitions at finite temperatures
• Non-Fermi-liquid phases in the two-band Hubbard model: Finite-temperature exact diagonalization study of Hund's rule coupling
• Staggered ordered phases in the three-orbital Hubbard model
• Mott transitions with partially-filled correlated orbitals
• Orbital-selective Mott transitions in the 2-band J_z-model: a high-precision quantum Monte Carlo study
• Distinct Nature of Orbital Selective Mott Phases Dominated by the Low-energy Local Spin Fluctuations
• Orbital-selective Mott transitions in two-band Hubbard models
• Slope-Reversed Mott Transition in Multiorbital Systems
• Quantitative determination of the orbital-selective Mott transition and quantum entanglement in the orbital-selective Mott phase