期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 26, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.260401
关键词
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资金
- EPSRC [EP/P009565/1]
- European Research Council under the European Unions Seventh Framework Programme (FP7/2007-2013)/ERC [319286 Q-MAC]
- EPSRC [EP/P009565/1] Funding Source: UKRI
Nonstationary longtime dynamics was recently observed in a driven two-component Bose-Einstein condensate coupled to an optical cavity [N. Dogra, M. Landini, K. Kroeger, L. Hruby, T. Donner, and T. Esslinger, 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 nonstationary behavior.
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