Frequency thermal response and cooling performance in a microscopic system with a time-dependent perturbation

Abstract

Following the nonequilibrium Green's function formalism we study the thermal transport in a composite chain subject to a time-dependent perturbation. The system is formed by two finite linear asymmetric harmonic chains subject to an on-site potential connected together by a time-modulated coupling. The ends of the chains are coupled to two phononic reservoirs at different temperatures. We present the relevant equations used to calculate the heat current along each segment. We find that the system presents different transport regimes according the driving frequency and temperature gradients. One of the regimes corresponds to a heat pump against thermal gradient, thus a characterization of the cooling performance of the device is presented. arXiv:1604.07714v1 [cond-mat.mes-hall]

Dynamics of energy transport and entropy production in ac-driven quantum electron systems

“…Recently, linear response proposals in close relation to thermodynamics have been formulated for open quantum systems and quasiclassical systems under periodic driving [13,[31][32][33]. The proper definition of the heat exchange between a quantum driven system and its macroscopic environment has been recently addressed in the context of few-level or spin systems in contact to phononic baths [34][35][36] and in systems of coupled quantum harmonic oscillators [37][38][39].…”

Heat transport and cooling performance in a nanomechanical system with local and non local interactions

“…where (2) indicates coefficients depending on contributions up to second order. After some algebra we define the following coefficients A (2) = J P cold + J D cold , with J D β containing the terms of Eq.…”

“…Consequently, in the adiabatic limit, CP obeys a power law dependence ∼ ∆T −1 . This dependence is obtained if we neglect the term C (2) in the denominator of CP (2) . Fig.…”

“…Non-local interactions constitute the basis of a great variety of natural phenomena, at both macro and nanoscale levels, and heat transport is amongst them. Most of first principle studies on thermal transport in low dimensional systems, are based on classical and quantum models that consider local (first-neighbor) interactions [1,2,3,4,5,6,7,8].…”

“…In our previous works [1,2] we treated the phononic heat transport through classical and quantum 1D chains with first-neighbor interactions between atoms, when subjected to thermo-mechanical time-dependent perturbations. We found that it is possible to dynamically tune the presence of different transport regimes.…”