Floquet Time Crystals.

@article{Else2016FloquetTC,
  title={Floquet Time Crystals.},
  author={Dominic Victor Else and Bela Bauer and C. Nayak},
  journal={Physical review letters},
  year={2016},
  volume={117 9},
  pages={
          090402
        }
}
We define what it means for time translation symmetry to be spontaneously broken in a quantum system and show with analytical arguments and numerical simulations that this occurs in a large class of many-body-localized driven systems with discrete time-translation symmetry. 

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