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  Local quantum criticality out of equilibrium: Effective temperatures and scaling in the steady-state regime

Ribeiro, P., Si, Q., & Kirchner, S. (2013). Local quantum criticality out of equilibrium: Effective temperatures and scaling in the steady-state regime. Europhysics Letters, 102(5): 50001, pp. 50001-1-50001-6. doi:10.1209/0295-5075/102/50001.

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Ribeiro, P.1, Autor           
Si, Q., Autor
Kirchner, S.2, Autor           
Affiliations:
1Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863404              
2Stefan Kirchner, cross-PKS/CPfS theory group, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863475              

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 Zusammenfassung: We study the out-of-equilibrium steady-state properties of the Bose-Fermi-Kondo model, describing a local magnetic moment coupled to two ferromagnetic leads that support bosonic (magnons) and fermionic (Stoner continuum electrons) low-energy excitations. This model describes the destruction of the Kondo effect as the coupling to the bosons is increased. Its phase diagram comprises three non-trivial fixed points. Using a dynamical large-N approach on the Keldysh contour, we study two different non-equilibrium setups: a) a finite bias voltage and b) a finite temperature gradient, imposed across the leads. The scaling behavior of the charge and energy currents is identified and characterized for all fixed points. We report the existence of a fixed-point-dependent effective temperature, defined though the fluctuation-dissipation relations of the local spin-susceptibility in the scaling regime, which permits to recover the equilibrium behavior of both dynamical and static spin-susceptibilities. Copyright (c) EPLA, 2013

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Sprache(n): eng - English
 Datum: 2013-06
 Publikationsstatus: Erschienen
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 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: eDoc: 668949
ISI: 000321122600001
DOI: 10.1209/0295-5075/102/50001
 Art des Abschluß: -

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Titel: Europhysics Letters
Genre der Quelle: Zeitschrift
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 102 (5) Artikelnummer: 50001 Start- / Endseite: 50001-1 - 50001-6 Identifikator: ISSN: 0295-5075