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arXiv 1901.04818cond-mat.stat-mech
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量子手征钟模型中的非平衡临界动力学

Nonequilibrium critical dynamics in the quantum chiral clock model

Rui-Zhen Huang, Shuai Yin

摘要:

本文研究了三态量子手征钟模型中的受驱动临界动力学。这是由最近的一个实验,它验证了Kibble-Zurek机制和有限时间标度在可重构的一维阵列的$^{87}$ Rb原子与可编程的相互作用。该实验模型与量子手征时钟模型具有相同的普适性类,并且具有非平凡的非整数动力学指数$z$。除了在实验中实现的改变横向场的情况下,我们还考虑了在改变纵向场的驱动动力学。对于这两种情况下,我们验证了有限时间缩放的非整数动态指数$z$。此外,我们确定的临界指数$β$和$δ$的数值第一次。我们还研究了实验中不可避免的包括热效应在内的动态标度行为。从非平衡动力学的观点来看,我们的结果有力地支持了有序相和无序相之间存在直接连续的相变。此外,我们表明,基于有限时间标度理论的方法提供了一个很有前途的方法来确定临界点和临界性质。

英文摘要:

In this paper we study the driven critical dynamics in the three-state quantum chiral clock model. This is motivated by a recent experiment, which verified the Kibble-Zurek mechanism and the finite-time scaling in a reconfigurable one-dimensional array of $^{87}$Rb atoms with programmable interactions. This experimental model shares the same universality class with the quantum chiral clock model and has been shown to possess a nontrivial non-integer dynamic exponent $z$. Besides the case of changing the transverse field as realized in the experiment, we also consider the driven dynamics under changing the longitudinal field. For both cases, we verify the finite-time scaling for a non-integer dynamic exponent $z$. Furthermore, we determine the critical exponents $β$ and $δ$ numerically for the first time. We also investigate the dynamic scaling behavior including the thermal effects, which are inevitably involved in experiments. From a nonequilibrium dynamic point of view, our results strongly support that there is a direct continuous phase transition between the ordered phase and the disordered phase. Also, we show that the method based on the finite-time scaling theory provides a promising approach to determine the critical point and critical properties.

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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