Coarsening of disordered quantum rotors under a bias voltage

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) ≃ 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.

From nonequilibrium quantum Brownian motion to impurity dynamics in one-dimensional quantum liquids

“…where we used Eqs. (36) and (37). By combining the expression for the Laplace transform of the cosine ∞ 0 dt e −λt cos(ωt) = λ/(λ 2 + ω 2 ) with Eqs.…”

“…Brownian motion [1,27] as well as the dynamics of more complex macroscopic systems [28][29][30][31][32][33][34][35][36] with a factorized initial density matrix have been studied in a variety of physical situations. However, in many cases it is not appropriate to assume Eq.…”

The effective temperature

“…In an out of equilibrium situation one can compare the linear response and the correlation and test whether, at least in some dynamic regime, a parameter replacing the environmental temperature appears. This route was first taken within meanfield quantum glassy models quenched from their disordered into their ordering phase [36,37,143]. In these models, the quantum FDT holds within the rapid stationary scale.…”