2025-03-26 ワシントン大学セントルイス校
＜関連情報＞
- https://source.washu.edu/2025/03/crystallizing-time/
- https://journals.aps.org/prx/abstract/10.1103/PhysRevX.15.011055
離散時間準結晶の実験的実現 Experimental Realization of Discrete Time Quasicrystals
Guanghui He, Bingtian Ye, Ruotian Gong, Changyu Yao, Zhongyuan Liu, Kater W. Murch, Norman Y. Yao, and Chong Zu
Physical Review X Published: 12 March, 2025
DOI:https://doi.org/10.1103/PhysRevX.15.011055
Abstract
Floquet (periodically driven) systems can give rise to unique nonequilibrium phases of matter without equilibrium analogs. The most prominent example is the realization of discrete time crystals. An intriguing question emerges: What other novel phases can manifest when the constraint of time periodicity is relaxed? In this study, we explore quantum systems subjected to a quasiperiodic drive. Leveraging a strongly interacting spin ensemble in diamond, we identify the emergence of long-lived discrete time quasicrystals. Unlike conventional time crystals, time quasicrystals exhibit robust subharmonic responses at multiple incommensurate frequencies. Furthermore, we show that the multifrequency nature of the quasiperiodic drive allows for the formation of diverse patterns associated with different discrete time quasicrystalline phases. Our findings demonstrate the existence of nonequilibrium phases in quasi-Floquet settings, significantly broadening the catalog of novel phenomena in driven many-body quantum systems.
