A self-reliant quantum cooler without an external control is proposed. To understand the thermal transport properties of the quantum system interacting with the baths described by the grand canonical ensemble, a two-level system with a single energy transport channel and a two-level coupled system with multi-channels are established. By considering the temperature dependence of the chemical potentials of the ultracold atom baths, the steady-state heat flows, particle currents, and entropy productions of these systems are derived. Results show that a steady heat current flows against the thermal bias for a nonequilibrium system coupled with ultracold quantum gases and the cooling rate can be enhanced by quantum coherence. (C) 2021 Elsevier B.V. All rights reserved.
Ultracold atomic gasesGrand-canonical ensemblesThe distribution functionQuantum coolerCooling rateGASES
Du, Jianying、Fu, Tong、Chen, Jingyi、Su, Shanhe、Chen, Jincan
NSTL
Elsevier
