Dissipation Induced Nonstationarity in a Quantum Gas
Abstract
Non-stationary long-time dynamics was recently observed in a driven two-component Bose-Einstein condensate coupled to an optical cavity [N. Dogra, et al. arXiv:1901.05974] and analyzed in mean-field theory. We solve the underlying model in the thermodynamic limit and show that this system is always dynamically unstable -- even when mean-field theory predicts stability. Instabilities always occur in higher-order correlation functions leading to squeezing and entanglement induced by cavity dissipation. The dynamics may be understood as the formation of a dissipative time crystal. We use perturbation theory for finite system sizes to confirm the non-stationary behaviour.
Keywords
Cite
@article{arxiv.1905.12880,
title = {Dissipation Induced Nonstationarity in a Quantum Gas},
author = {Berislav Buca and Dieter Jaksch},
journal= {arXiv preprint arXiv:1905.12880},
year = {2020}
}
Comments
Main text: 5 pages, 3 figures and Supplemental material: 6 pages, 2 figures. Version as accepted by Phys. Rev. Lett