Observation of a Time Quasicrystal and Its Transition to a Superfluid Time Crystal.

@article{Autti2018ObservationOA,
  title={Observation of a Time Quasicrystal and Its Transition to a Superfluid Time Crystal.},
  author={S. Autti and V. B. Eltsov and Grigory E. Volovik},
  journal={Physical review letters},
  year={2018},
  volume={120 21},
  pages={
          215301
        }
}
We report experimental realization of a quantum time quasicrystal and its transformation to a quantum time crystal. We study Bose-Einstein condensation of magnons, associated with coherent spin precession, created in a flexible trap in superfluid ^{3}He-B. Under a periodic drive with an oscillating magnetic field, the coherent spin precession is stabilized at a frequency smaller than that of the drive, demonstrating spontaneous breaking of discrete time translation symmetry. The induced… 

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