https://www.researchgate.net/publication/321936517_From_time_quasicrystal_to_superfluid_time_crystal
We report experimental realization of a quantum time quasicrystal, and its transformation to a quantum time crystal. We study magnon BECs, associated with coherent spin precession, created in a flexible trap in superfluid $^3$He-B. Under a periodic RF drive, 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 precession frequency is incommensurate with the drive, and hence the obtained state a time quasicrystal. When the drive is turned off, the self sustained coherent precession lives a macroscopically-long time, now representing a time crystal with broken symmetry with respect to continuous time translations. Additionally, the magnon BEC manifests spin superfluidity, justifying calling the obtained state a time supersolid or a time super-crystal.
- December 2017
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