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arXiv 1012.0417cond-mat.stat-mech
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二维XY模型的猝灭动力学

Quench dynamics of the 2d XY model

Asja Jelic, Leticia F. Cugliandolo

摘要:

我们研究了二维XY模型在不同的实验方案下,通过Berezinskiii-Kosterlitz-BKT(Berezinskiii-Kosterlitz-Bertelless)相变冷却时的非平衡动力学.我们专注于不断增长的相关长度和密度的拓扑缺陷(涡)的演变。通过使用蒙特卡罗模拟,我们首先确定的时间和温度的依赖关系的增长相关长度后,无限快速淬火从以上的转变温度的准长程序区域。的功能形式是一致的对数校正的扩散定律,它用于验证动态缩放在这个问题。这一分析阐明了束缚涡和自由涡所起的不同动力学作用。然后,我们重新审视Kibble-Zurek机制的热相变中的无序状态的拓扑缺陷的困扰。我们提供了一个理论的淬火速率依赖于系统的BKT型过渡,超越了平衡标度参数。最后,我们讨论了我们的研究结果的影响,包括平面铁磁体和液晶以及金斯堡-朗道方法二维自由衰减湍流的涡旋激发的物理系统主机。

英文摘要:

We investigate the out of equilibrium dynamics of the two-dimensional XY model when cooled across the Berezinskii-Kosterlitz-Thouless (BKT) phase transition using different protocols. We focus on the evolution of the growing correlation length and the density of topological defects (vortices). By using Monte Carlo simulations we first determine the time and temperature dependence of the growing correlation length after an infinitely rapid quench from above the transition temperature to the quasi-long range order region. The functional form is consistent with a logarithmic correction to the diffusive law and it serves to validate dynamic scaling in this problem. This analysis clarifies the different dynamic roles played by bound and free vortices. We then revisit the Kibble-Zurek mechanism in thermal phase transitions in which the disordered state is plagued with topological defects. We provide a theory of quenching rate dependence in systems with the BKT-type transition that goes beyond the equilibrium scaling arguments. Finally, we discuss the implications of our results to a host of physical systems with vortex excitations including planar ferromagnets and liquid crystals as well as the Ginzburg-Landau approach to bidimensional freely decaying turbulence.

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