Fractional time crystals
Fractional time crystals
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DOI：
10.1103/physreva.99.033626
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发表时间：
2019-03-29
影响因子：
2.9
通讯作者：
Sacha, Krzysztof
中科院分区：
文献类型：
--
作者：
Matus, Pawel;Sacha, Krzysztof
时间晶体是能够揭示时间域中凝聚态行为的量子系统。众所周知，在周期性驱动的多体系统中，当粒子之间的相互作用迫使系统以驱动周期的整数倍的周期演化时，可以观察到时间上的结晶。这种现象被称为离散时间晶体形成。在这里，我们考虑超冷原子反弹的振荡原子镜，并表明该系统可以自发地形成一个离散的时间晶体，其运动周期和驱动周期的比例是一个有理数。这种离散时间晶体需要更高阶的谐振驱动，这是分析在这里与原始的方法的帮助下。
Time crystals are quantum systems that are able to reveal condensed matter behavior in the time domain. It is known that crystallization in time can be observed in a periodically driven many-body system when interactions between particles force a system to evolve with a period that is an integer multiple of a driving period. This phenomenon is dubbed discrete time crystal formation. Here, we consider ultracold atoms bouncing on an oscillating atom mirror and show that the system can spontaneously form a discrete time crystal where the ratio of a period of its motion and a driving period is a rational number. This kind of discrete time crystal requires higher-order resonant driving, which is analyzed here with the help of an original approach.