Dissipative cooling induced by pulse perturbations

TL;DR

This paper demonstrates that pulse perturbations in coupled quantum Ising models with dissipation can induce cooling of low-energy states, leading to long-lived, non-thermal symmetry-broken states above equilibrium critical temperatures.

Contribution

It introduces a novel mechanism of dissipative cooling via pulse perturbations in quantum Ising models, highlighting the role of energy-dependent dissipation.

Findings

Pulse perturbations can cool the low-energy sector of the system.

A transient symmetry-broken state can be stabilized at high temperatures.

Properly tailored pulses can prolong the non-thermal state.

Abstract

We investigate the dynamics brought on by an impulse perturbation in two infinite-range quantum Ising models coupled to each other and to a dissipative bath. We show that, if dissipation is faster the higher the excitation energy, the pulse perturbation cools down the low-energy sector of the system, at the expense of the high-energy one, eventually stabilising a transient symmetry-broken state at temperatures higher than the equilibrium critical one. Such non-thermal quasi-steady state may survive for quite a long time after the pulse, if the latter is properly tailored.