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.
@article{arxiv.1806.01057,
title = {Coherent phonon lasing in a thermal quantum nanomachine},
author = {Paweł Karwat and Doris E. Reiter and Tilmann Kuhn and Ortwin Hess},
journal= {arXiv preprint arXiv:1806.01057},
year = {2018}
}