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arXiv 1909.09558cond-mat.stat-mechquant-ph
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非厄米量子系统中的无序关联函数

Out-of-time-ordered correlator in non-Hermitian quantum systems

Liang-Jun Zhai, Shuai Yin

摘要:

研究了非厄米量子伊辛系统中的非时序关联函数(OTOC)的行为。结果表明,OTOC不仅可以诊断出Yang-Lee边奇异的基态异常点,还可以诊断出激发态的\textit{dynamical}异常点.我们发现,宇称时间对称相位下OTOC的演化可以分为两个阶段:在短时间阶段,OTOC发生周期性振荡,当参数在基态例外点附近时,这种振荡行为可以用$(0+1)$ D Yang-Lee边奇异性的标度理论和$(1+1)$ D量子伊辛模型的标度理论来描述;而在长时间阶段,OTOC受动力学异常点的控制呈指数增长。然后讨论了可能的实验实现。

英文摘要:

We study the behavior of the out-of-time-ordered correlator (OTOC) in a non-Hermitian quantum Ising system. We show that the OTOC can diagnose not only the ground state exceptional point, which hosts the Yang-Lee edge singularity, but also the \textit{dynamical} exceptional point at the excited state. We find that the evolution of the OTOC in the parity-time symmetric phase can be divided into two stages: in the short-time stage, the OTOC oscillates periodically, and when the parameter is near the ground state exceptional point, this oscillation behavior can be described by both the scaling theory of the $(0+1)$D Yang-Lee edge singularity and the scaling theory of the $(1+1)$D quantum Ising model; while in the long-time stage the OTOC increases exponentially, controlled by the dynamical exceptional point. Possible experimental realizations are then discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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