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

TL;DR

This paper investigates the orbital-selective Mott phase in a multi-band Hubbard model, revealing non-Fermi liquid behavior linked to double-exchange physics, with implications for understanding correlated electron systems.

Contribution

It demonstrates the connection between the orbital-selective Mott phase and a generalized double-exchange model, highlighting non-Fermi liquid properties in this regime.

Findings

High-temperature phase shows finite scattering rate at Fermi level

Non-Fermi liquid behavior depends on spin anisotropy

Orbital-selective Mott phase relates to double-exchange physics

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.