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

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Journal Title
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Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
2018-05-25
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Mcode
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Language
en
Pages
1-5
Series
Physical Review Letters, Volume 120, issue 21
Abstract
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 He3-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 precession frequency is incommensurate with the drive, and hence, the obtained state is 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 condensate manifests spin superfluidity, justifying calling the obtained state a time supersolid or a time supercrystal.
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| openaire: EC/H2020/694248/EU//TOPVAC
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Citation
Autti, S, Eltsov, V B & Volovik, G E 2018, ' Observation of a Time Quasicrystal and Its Transition to a Superfluid Time Crystal ', Physical Review Letters, vol. 120, no. 21, 215301, pp. 1-5 . https://doi.org/10.1103/PhysRevLett.120.215301