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arXiv 1406.5237cond-mat.stat-mech
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虚时量子临界弛豫的广义动力学标度

Generalized dynamic scaling for quantum critical relaxation in imaginary time

Shuyi Zhang, Shuai Yin, Fan Zhong

摘要:

研究了初始关联长度为零且初始序参量为任意值$M_0$的量子系统的弛豫临界动力学。我们发现,在量子临界动力学中,$M_0$在尺度变换下的行为偏离了简单的幂律,这是以前对非常小的$M_0$提出的。一个通用的特征函数,然后建议描述重新缩放的初始磁化,类似于经典的临界动力学。这个特征函数被证明是能够描述的量子临界动力学在短期和长期的演化阶段。采用一维横场伊辛模型数值求解了特征函数的具体形式。我们证明,它是适用的,只要系统是在量子临界点附近。特征函数的普适性是由属于同一普适性类的模型的数值模拟证实的。

英文摘要:

We study the imaginary-time relaxation critical dynamics of a quantum system with a vanishing initial correlation length and an arbitrary initial order parameter $M_0$. We find that in quantum critical dynamics, the behavior of $M_0$ under scale transformations deviates from a simple power-law, which was proposed for very small $M_0$ previously. A universal characteristic function is then suggested to describe the rescaled initial magnetization, similar to classical critical dynamics. This characteristic function is shown to be able to describe the quantum critical dynamics in both short- and long-time stages of the evolution. The one-dimensional transverse-field Ising model is employed to numerically determine the specific form of the characteristic function. We demonstrate that it is applicable as long as the system is in the vicinity of the quantum critical point. The universality of the characteristic function is confirmed by numerical simulations of models belonging to the same universality class.

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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