Observation of a Dissipative Time Crystal.

@article{Keler2020ObservationOA,
  title={Observation of a Dissipative Time Crystal.},
  author={Hans Ke{\ss}ler and Phatthamon Kongkhambut and Christoph Georges and Ludwig Mathey and Jayson G. Cosme and Andreas Hemmerich},
  journal={Physical review letters},
  year={2020},
  volume={127 4},
  pages={
          043602
        }
}
We present the first experimental realization of a time crystal stabilized by dissipation. The central signature in our implementation in a driven open atom-cavity system is a period doubled switching between distinct checkerboard density wave patterns, induced by the interplay between controlled cavity dissipation, cavity-mediated interactions, and external driving. We demonstrate the robustness of this dynamical phase against system parameter changes and temporal perturbations of the driving. 
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