Discrete Time Crystals in the Absence of Manifest Symmetries or Disorder in Open Quantum Systems
Discrete Time Crystals in the Absence of Manifest Symmetries or Disorder in Open Quantum Systems
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DOI：
10.1103/physrevlett.122.015701
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发表时间：
2019-01-08
影响因子：
8.6
通讯作者：
Lesanovsky, I
中科院分区：
文献类型：
--
作者：
Gambetta, F. M.;Carollo, F.;Lesanovsky, I
在周期驱动的开放量子系统中，我们建立了亚稳态和离散时间结晶相之间的联系。我们强调的机制既不需要系统显示任何微观对称性，也不需要无序的存在，而是依赖于亚稳态的出现。我们在一个开放的量子自旋系统中详细研究了这一点，这是一个正则模型，用于探索强相互作用耗散里德堡气体中的集体现象。在这里，一个半经典的方法揭示了一个强大的离散时间结晶相的出现在热力学极限，其中亚稳性，耗散和粒子间的相互作用发挥了至关重要的作用。我们进行数值模拟，以调查的相互作用范围的依赖性，从所有到所有的短程，和时间晶体的寿命与系统大小的缩放。
We establish a link between metastability and a discrete time-crystalline phase in a periodically driven open quantum system. The mechanism we highlight requires neither the system to display any microscopic symmetry nor the presence of disorder, but relies instead on the emergence of a metastable regime. We investigate this in detail in an open quantum spin system, which is a canonical model for the exploration of collective phenomena in strongly interacting dissipative Rydberg gases. Here, a semiclassical approach reveals the emergence of a robust discrete time-crystalline phase in the thermodynamic limit in which metastability, dissipation, and interparticle interactions play a crucial role. We perform numerical simulations in order to investigate the dependence on the range of interactions, from all to all to short ranged, and the scaling with system size of the lifetime of the time crystal.