非平衡相变与 Floquet Kibble-Zurek 标度
量子气体
2016-11-03 v3
摘要
我们研究了周期驱动系统中非平衡量子相变的缓慢穿越。我们明确考虑具有均匀时变磁场的自旋链，并聚焦于绝热连接到静态模型基态的 Floquet 态。我们发现该 {\it Floquet 基态}经历了一系列以非平凡拓扑为特征的量子相变。为了动态探测这些相变，我们提议从一个大驱动频率开始并随时间缓慢降低它。结合解析与数值方法，我们揭示了一种在中等相互作用存在下依然持续的 Kibble-Zurek 标度。该标度可用于实验展示否则无法观测的非平衡相变。
引用
@article{arxiv.1510.08866,
title = {Non equilibrium phase transitions and Floquet Kibble-Zurek scaling},
author = {Angelo Russomanno and Emanuele G. Dalla Torre},
journal= {arXiv preprint arXiv:1510.08866},
year = {2016}
}
备注
7 pages, 3 figures, Supplemental Material. (In this last version, the one published in EPL, we provide a better discussion of the Floquet adiabatic theorem, the construction of the Floquet ground state as an adiabatic continuation and the nature of the phase transitions.)