Non-fermi-liquid behavior and double-exchange physics in orbital-selective mott systems

We study a multiband 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 given by a generalized double-exchange model. The high-temperature disordered pha...

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Bibliographic Details
Published in:Physical review letters 2005-11, Vol.95 (20), p.206401.1-206401.4, Article 206401
Main Authors: BIERMANN, S, DE' MEDICI, L, GEORGES, A
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Metal-insulator transitions and other electronic transitions
Physics
Theories and models of many electron systems
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Summary:We study a multiband 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 given by 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.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.95.206401