Time crystals in a shaken atom-cavity system

@article{Cosme2019TimeCI,
  title={Time crystals in a shaken atom-cavity system},
  author={Jayson G. Cosme and Jim Skulte and Ludwig Mathey},
  journal={Physical Review A},
  year={2019},
  volume={100},
  pages={053615}
}
We demonstrate the emergence of a time crystal of atoms in a high-finesse optical cavity driven by a phase-modulated transverse pump field, resulting in a shaken lattice. This shaken system exhibits macroscopic oscillations in the number of cavity photons and order parameters at noninteger multiples of the driving period, which signals the appearance of an incommensurate time crystal. The subharmonic oscillatory motion corresponds to dynamical switching between symmetry-broken states, which are… 

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