Self-reliant cooling of ultracold atoms

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.

Automated summary

A self-reliant quantum cooler without external control is proposed in this study. By establishing models to study the thermal transport properties of quantum systems interacting with baths, it is found that an unbalanced system coupled with ultracold quantum gases can achieve steady heat flow, and the cooling rate can be enhanced by quantum coherence.