Dynamical phase transition in Floquet optical bistable systems: An approach from finite-size quantum systems

Dynamical phase transition in Floquet optical bistable systems: An approach from finite-size quantum systems
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Floquet 光学双稳态系统中的动态相变:有限尺寸量子系统的方法

DOI:
10.1103/physreva.101.013809
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发表时间:
2020
期刊:
Phys. Rev. A
影响因子:
--
通讯作者:
and Seiji Miyashita
and Seiji Miyashita
中科院分区:
--
文献类型:
--
作者:
Tatsuhiko Shirai;Synge Todo;and Seiji Miyashita

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本文研究了在时间周期驱动场作用下光学系统的动力学相变。相变发生在作为驱动场频率的函数的极限环结构中。在热力学极限中,单个极限环在过渡点处被分成两个分离的极限环。然而,在有限尺寸系统中,由于量子隧穿效应,总是存在一个极限环。我们使用Floquet耗散映射,这是一个时间演化算子在一个周期内的动力学量子主方程,并讨论了衰减率的基础上的地图的主导特征值的弛豫动力学的极限环。我们发现,衰减率表现出质的不同的系统尺寸的依赖性之前和之后的相变,它显示了有限大小的尺度的转折点周围的旋节现象。本文提供了一种系统的方法来研究在时间周期驱动的开放系统中观察到的动力学相变的Floquet耗散映射。
We study a dynamical phase transition in optical bistable systems subject to a time-periodic driving field. The phase transition occurs in the structure of a limit cycle as a function of the frequency of the driving field. In the thermodynamic limit, a single limit cycle is divided into two separated limit cycles at the transition point. In finite-size systems, however, there is always a single limit cycle due to the quantum tunneling effect. We use a Floquet dissipative map, which is a time-evolution operator over one period in dynamics given by a quantum master equation, and discuss the decay rate of relaxation dynamics into the limit cycle based on the dominant eigenvalue of the map. We found that the decay rate exhibits qualitatively different system-size dependence before and after the phase transition and it shows a finite-size scaling of spinodal phenomena around the transition point. The present paper provides a systematic way of studying a dynamical phase transition observed in time-periodically driven open systems in terms of the Floquet dissipative map.
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