Realization of an inherent time crystal in a dissipative many-body system
arXiv:2310.04847 · doi:10.1038/s41467-023-41905-3
Abstract
Time crystals are many-body states that spontaneously break translation symmetry in time the way that ordinary crystals do in space. While experimental observations have confirmed the existence of discrete or continuous time crystals, these realizations have relied on the utilization of periodic forces or effective modulation through cavity feedback. The original proposal for time crystals is that they would represent self-sustained motions without any external periodicity, but realizing such purely self-generated behavior has not yet been achieved. Here, we provide theoretical and experimental evidence that many-body interactions can give rise to an inherent time crystalline phase. Following a calculation that shows an ensemble of pumped four-level atoms can spontaneously break continuous time translation symmetry, we observe periodic motions in an erbium-doped solid. The inherent time crystal produced by our experiment is self-protected by many-body interactions and has a measured coherence time beyond that of individual erbium ions.
References in corpus (6)
- Absence of Quantum Time Crystals
- Dynamical Phase Transitions and Instabilities in Open Atomic Many-Body Systems
- Discrete Time-Crystalline Order in Cavity and Circuit QED Systems
- Observation of a many-body-localized discrete time crystal with a programmable spin-based quantum simulator
- Limit cycle phase in driven-dissipative spin systems
- Emergent limit cycles and time crystal dynamics in an atom-cavity system