Coherent phonon lasing in a thermal quantum nanomachine

TL;DR

This paper introduces a heat-gradient driven quantum nanomachine that uses coupled nanosystems to achieve phonon lasing through quantum inversion, enabling coherent optomechanical oscillations.

Contribution

It presents a novel nanomachine design utilizing quantum coupling and heat gradients to generate and sustain phonon lasing, advancing nanoscale coherent phonon control.

Findings

Demonstrates inversion in coupled quantum nanosystems driven by heat gradients.

Shows that positive inversion can produce coherent phonon lasing.

Uses a Lindblad quantum master equation approach for analysis.

Abstract

The notion of nanomachines has recently emerged to engage and use collective action of ensembles of nanoscale components or systems. Here we present a heat-gradient driven nanomachine concept which through appropriate coupling between quantum nanosystems is capable of realising and maintaining an inversion. Based on a Lindblad form of the Quantum Master Equation with a semiclassical coupling to the lattice displacement phonon field we show that this positive inversion can be harnessed to generate coherent optomechanical oscillations and phonon lasing.