O'Sullivan, J;
Lunt, O;
Zollitsch, CW;
Thewalt, MLW;
Morton, JJL;
Pal, A;
(2020)
Signatures of discrete time crystalline order in dissipative spin ensembles.
New Journal of Physics
, 22
(8)
10.1088/1367-2630/ab9fbe.
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Abstract
Discrete time-translational symmetry in a periodically driven many-body system can be spontaneously broken to form a discrete time crystal, an exotic new phase of matter. We present observations characteristic of discrete time crystalline order in a driven system of paramagnetic P-donor impurities in isotopically enriched 28Si cooled below 10 K. The observations exhibit a stable subharmonic peak at half the drive frequency which remains pinned even in the presence of pulse error, a signature of discrete time crystalline order. This signal has a finite lifetime of ∼ 100 Floquet periods, but this effect is long-lived relative to coherent spin–spin interaction timescales, lasting ∼ 104 times longer.We present simulations of the system based on the paradigmatic central spin model and show good agreement with experiment. We investigate the role of dissipation and interactions within this model, and show that both are capable of giving rise to discrete time crystal-like behaviour.
| Type: | Article |
|---|---|
| Title: | Signatures of discrete time crystalline order in dissipative spin ensembles |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/1367-2630/ab9fbe |
| Publisher version: | https://doi.org/10.1088/1367-2630/ab9fbe |
| Language: | English |
| Additional information: | This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ |
| Keywords: | Science & Technology, Physical Sciences, Physics, Multidisciplinary, Physics, time crystal, ESR, Floquet, MBL, many body localisation, electron spin resonance, discrete time crystal, SILICON |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10111713 |
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