非线性Floquet系统中的超流性与预热化
Superfluidity vs prethermalisation in a nonlinear Floquet system
摘要：
我们表明，超流性可以用来防止热化的非线性Floquet系统。一般来说，周期性驱动使相互作用系统沸腾到无特征的无限温度状态。快速驱动是一种已知的策略，以推迟具有大但总是有限的沸腾时间的Floquet加热。相比之下，使用一个非线性驱动系统的晶格，我们表明存在一个连续类的初始状态，不热化。这种热化的缺乏与稳定的超流运动的存在和持续有关。
英文摘要：
We show that superfluidity can be used to prevent thermalisation in a nonlinear Floquet system. Generically, periodic driving boils an interacting system to a featureless infinite temperature state. Fast driving is a known strategy to postpone Floquet heating with a large but always finite boiling time. In contrast, using a nonlinear periodically-driven system on a lattice, we show the existence of a continuous class of initial states which do not thermalise at all. This absence of thermalisation is associated to the existence and persistence of a stable superflow motion.
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