Heat pumping in nanomechanical systems

TL;DR

This paper introduces a phonon pumping method to transfer heat from cold to hot bodies in nanomechanical systems, enabling cooling without active feedback and analyzing the minimal achievable temperature.

Contribution

It proposes a novel phonon pumping mechanism for cooling nanomechanical systems without active feedback, with theoretical analysis of the lowest attainable temperature.

Findings

Phonon pump can transfer heat from cold to hot bodies.

Cooling nanomechanical systems without active feedback.

Calculated minimum temperature achievable by the refrigerator.

Abstract

We propose using a phonon pumping mechanism to transfer heat from a cold to a hot body using a propagating modulation of the medium connecting the two bodies. This phonon pump can cool nanomechanical systems without the need for active feedback. We compute the lowest temperature that this refrigerator can achieve.