Clean Floquet Time Crystals: Models and Realizations in Cold Atoms.

@article{Huang2017CleanFT,
  title={Clean Floquet Time Crystals: Models and Realizations in Cold Atoms.},
  author={Biao Huang and Ying-Hai Wu and W. Vincent Liu},
  journal={Physical review letters},
  year={2017},
  volume={120 11},
  pages={
          110603
        }
}
Time crystals, a phase showing spontaneous breaking of time-translation symmetry, has been an intriguing subject for systems far away from equilibrium. Recent experiments found such a phase in both the presence and the absence of localization, while in theories localization by disorder is usually assumed a priori. In this work, we point out that time crystals can generally exist in systems without disorder. A series of clean quasi-one-dimensional models under Floquet driving are proposed to… 

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