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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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2018-05-25

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Department of Applied Physics

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en

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1-5

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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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DOI

10.1103/PhysRevLett.120.215301

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

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https://urn.fi/URN:NBN:fi:aalto-201806253503

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[article-cris] Perustieteiden korkeakoulu / SCI