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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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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1EB4-C Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0015-1EB5-A
Genre: Journal Article

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Ribeiro, P.1, Author              
Si, Q., Author
Kirchner, S.2, Author              
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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 Abstract: 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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Language(s): eng - English
 Dates: 2013-06
 Publication Status: Published in print
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 Rev. Type: -
 Identifiers: eDoc: 668949
ISI: 000321122600001
DOI: 10.1209/0295-5075/102/50001
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Title: Europhysics Letters
Source Genre: Journal
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Pages: - Volume / Issue: 102 (5) Sequence Number: 50001 Start / End Page: 50001-1 - 50001-6 Identifier: ISSN: 0295-5075