2020 •
Signatures of discrete time crystalline order in dissipative spin ensembles
Authors:
James O'Sullivan, Oliver Lunt, Christoph W. Zollitsch, M. L. W. Thewalt, John J. L. Morton, Arijeet Pal, Arijeet Pal
Abstract:AbstractDiscrete 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 (...) AbstractDiscrete 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.(Read More)
James O’Sullivan, Oliver Lunt, Christoph W Zollitsch, M L W Thewalt, John J L Morton, Arijeet Pal
New Journal of Physics ·
2020
Condensed matter physics |
Statistical physics |
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