Publication : t10/270

Coarsening of disordered quantum rotors under a bias voltage

Aron C. (Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie, Paris VI, 4 pl. Jussieu, 75005 Paris, FRANCE)
Biroli G. (CEA, IPhT (Institut de Physique Théorique), F-91191 Gif-sur-Yvette, France)
Cugliandolo L.F. (Laboratoire de Physique Théorique et Hautes Energies (LPTHE), Université Pierre et Marie Curie, Paris VI, 4 pl. Jussieu, 75005 Paris, FRANCE)
Abstract:
We solve the dynamics of an ensemble of interacting rotors coupled to two leads at different chemical potential letting a current flow through the system and driving it out of equilibrium. We show that at low temperature the coarsening phase persists under the voltage drop up to a critical value of the applied potential that depends on the characteristics of the electron reservoirs. We discuss the properties of the critical surface in the temperature, voltage, strength of quantum fluctuations and coupling to the bath phase diagram. We analyze the coarsening regime finding, in particular, which features are essentially quantum mechanical and which are basically classical in nature. We demonstrate that the system evolves via the growth of a coherence length with the same time-dependence as in the classical limit, $R(t) simeq t^{1/2}$ -- the scalar curvature driven universality class. We obtain the scaling function of the correlation function at late epochs in the coarsening regime and we prove that it coincides with the classical one once a prefactor that encodes the dependence on all the parameters is factorized. We derive a generic formula for the current flowing through the system and we show that, for this model, it rapidly approaches a constant that we compute.
Année de publication : 2010
Revue : Phys. Rev. B 82 174203 (2010)
DOI : 10.1103/PhysRevB.82.174203
Preprint : arXiv:1005.2414v2
Langue : Anglais
NB : 53 pages, 12 figures

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