Europhys. Lett.
Volume 70, Number 5, June 2005
Page(s) 642 - 648
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 27 April 2005
Europhys. Lett., 70 (5), pp. 642-648 (2005)
DOI: 10.1209/epl/i2004-10515-8

Study of a fluctuation-dissipation relation of a dissipative driven mesoscopic system

L. Arrachea1 and L. F. Cugliandolo2, 3

1  Departamento de Física, Universidad de Buenos Aires Pab. I, Ciudad Universitaria 1428, Argentina
2  Laboratoire de Physique Théorique de l'Ecole Normale Supérieure 24 rue Lhomond, 75231 Paris Cedex 05, France
3  Laboratoire de Physique Théorique et Hautes Energies 4 place Jussieu, 75252 Paris Cedex 05, France

received 13 October 2004; accepted in final form 8 April 2005
published online 27 April 2005

We study the nonequilibrium dynamics of a mesoscopic metallic ring threaded by a time-dependent magnetic field and coupled to an electronic reservoir. We analyze the relation between the (nonstationary) real-time Keldysh and retarded Green functions and we argue that, in the linear-response regime with weak heat transfer to the environment, an effective temperature accounts for the modification of the equilibrium fluctuation-dissipation relation. We discuss possible extensions of this analysis.

72.10.-d - Theory of electronic transport; scattering mechanisms.
73.23.-b - Electronic transport in mesoscopic systems.

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