Non-Fermi Liquid Behavior and Double-Exchange Physics in Orbital-Selective Mott Systems

Abstract

We study a multi-band Hubbard model in its orbital selective Mott phase, in which localized electrons in a narrow band coexist with itinerant electrons in a wide band. The low-energy physics of this phase is shown to be closely related to that of a generalized double-exchange model. The high-temperature disordered phase thus differs from a Fermi liquid, and displays a finite scattering rate of the conduction electrons at the Fermi level, which depends continuously on the spin anisotropy.

5 pages, minor typos corrected

References in corpus (5)

• Orbital-selective Mott transitions in the degenerate Hubbard model
• Novel Mott Transitions in Non-Isotropic Two-Band Hubbard Model
• Spin, charge and orbital fluctuations in a multi-orbital Mott insulator
• Single Mott Transition in Multi-Orbital Hubbard Model
• Orbital-selective Mott transitions in the anisotropic two-band Hubbard model at finite temperatures

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