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arXiv 2409.13293cond-mat.stat-mechquant-ph
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动力学量子相变中的独特与普适标度

Unique and Universal scaling in dynamical quantum phase transitions

Xiang Zhang, Liangdong Hu, Fuxiang Li

AI总结:

本文揭示了缓慢驱动的动力学量子相变中临界时间与淬火速率呈幂律标度关系,其指数由普适类决定,并基于 Kibble-Zurek 机制验证了该标度在单粒子、多体及厄米与非厄米系统中的普适性。

摘要:

普适性与标度是平衡态连续相变中的基本概念。在此,我们揭示了缓慢驱动的动力学量子相变中临界时间的独特且普适的标度行为。超越与平衡态相变的类比,我们发现临界时间与淬火速率呈幂律标度关系,且标度指数完全由底层的普适类决定。我们基于 Kibble-Zurek 机制中的绝热-脉冲场景解释了这一独特标度行为。我们验证了该普适标度行为不仅在非相互作用单粒子系统中成立,也在多体相互作用系统中成立;不仅在厄米系统中成立,也在非厄米系统中成立。我们的研究揭示了动力学相变与平衡态相变之间深刻且根本的联系。

英文摘要:

Universality and scaling are fundamental concepts in equilibrium continuous phase transitions. Here, we unveil a unique and universal scaling behavior of the critical time in slowly driven dynamical quantum phase transition. Going beyond the analogy with equilibrium phase transition, we find that the critical time exhibits a power-law scaling with quenching rate and the scaling exponent is fully determined by underlining universality class. We explain this unique scaling behavior based on the adiabatic-impulse scenario in the Kibble-Zurek mechanism. This universal scaling behavior is verified to be valid not only in noninteracting single-particle system, but also in many-body interacting system, and not only in Hermitian system, but also in non-Hermitian system. Our study unravels a deep and fundamental relationship between dynamical phase transition and equilibrium phase tranition.

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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