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arXiv 1612.02419cond-mat.stat-mech
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预热critical states中的动态交叉

Dynamical crossovers in prethermal critical states

Alessio Chiocchetta, Andrea Gambassi, Sebastian Diehl, Jamir Marino

摘要:

研究了具有N分量序参量和$O(N)$对称性的相互作用量子场论在动力学临界点附近突然猝灭的预热动力学。取决于初始条件,序参量的演变,以及响应和关联函数,可以表现出普遍的动力学缩放制度之间的时间交叉,分别由量子和经典的预热不动点,以及从高斯到非高斯预热动力学缩放的交叉。结合最近的实验,这表明可以使用猝灭来探索量子多体系统非平衡动力学中发生的丰富多样的动力学临界点。我们说明了这一事实,通过使用重整化群技术和非微扰大$N$限制的组合。

英文摘要:

We study the prethermal dynamics of an interacting quantum field theory with a N-component order parameter and $O(N)$ symmetry, suddenly quenched in the vicinity of a dynamical critical point. Depending on the initial conditions, the evolution of the order parameter, and of the response and correlation functions, can exhibit a temporal crossover between universal dynamical scaling regimes governed, respectively, by a quantum and a classical prethermal fixed point, as well as a crossover from a Gaussian to a non-Gaussian prethermal dynamical scaling. Together with a recent experiment, this suggests that quenches may be used in order to explore the rich variety of dynamical critical points occurring in the non-equilibrium dynamics of a quantum many-body system. We illustrate this fact by using a combination of renormalization group techniques and a non-perturbative large-$N$ limit.

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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