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Discrete Time Crystals
Annual Review of Condensed Matter Physics ( IF 22.6 ) Pub Date : 2020-03-16 , DOI: 10.1146/annurev-conmatphys-031119-050658
Dominic V. Else 1 , Christopher Monroe 2, 3 , Chetan Nayak 4, 5 , Norman Y. Yao 6, 7
Affiliation  

Experimental advances have allowed for the exploration of nearly isolated quantum many-body systems whose coupling to an external bath is very weak. A particularly interesting class of such systems is those that do not thermalize under their own isolated quantum dynamics. In this review, we highlight the possibility for such systems to exhibit new nonequilibrium phases of matter. In particular, we focus on discrete time crystals, which are many-body phases of matter characterized by a spontaneously broken discrete time-translation symmetry. We give a definition of discrete time crystals from several points of view, emphasizing that they are a nonequilibrium phenomenon that is stabilized by many-body interactions, with no analog in noninteracting systems. We explain the theory behind several proposed models of discrete time crystals, and compare several recent realizations, in different experimental contexts.

中文翻译:


离散时间晶体

实验的进展允许探索几乎孤立的量子多体系统,该系统与外部浴的耦合非常弱。这种系统中特别有趣的一类是那些不会在其自身孤立的量子动力学下发生热化的系统。在这篇综述中,我们着重指出了此类系统展现出新的物质非平衡相的可能性。特别是,我们专注于离散时间晶体,它们是物质的多体相,其特征是自发地破坏了离散时间平移对称性。我们从多个角度给出了离散时间晶体的定义,强调它们是一种非平衡现象,通过多体相互作用得以稳定,在非相互作用系统中没有类似物。我们将解释几个提出的离散时间晶体模型背后的理论,

更新日期:2020-04-21
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