Time crystals in periodically driven systems

@article{Yao2018TimeCI,
  title={Time crystals in periodically driven systems},
  author={Norman Y. Yao and C. Nayak},
  journal={Physics Today},
  year={2018}
}
When the discrete time-translation symmetry of isolated, periodically driven systems is spontaneously broken, a new phase of matter can emerge. 

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