arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1703.09486cond-mat.stat-mechcond-mat.dis-nn
收藏

三维驱动无序系统中的非平衡Kosterlitz-numerless跃迁

Nonequilibrium Kosterlitz-Thouless transition in a three-dimensional driven disordered system

Taiki Haga

摘要:

我们在随机场XY模型中证明了一个三维的Kosterlitz-koreless(KT)相变,它是由热平衡驱动的。采用自旋波近似和泛函重整化群方法,在弱无序区,三维驱动随机场XY模型呈现准长程序相,其中关联函数呈现幂律衰减,其非普适指数依赖于无序强度.这一结果与以前的数值研究报告是一致的。我们进一步发展了一个唯象理论的三维KT过渡,考虑到涡的影响。该理论的要点在于,系统相对于垂直于驱动方向的平面的横截面基本上与二维纯XY模型相同。

英文摘要:

We demonstrate a three-dimensional Kosterlitz-Thouless (KT) transition in the random field XY model driven out of thermal equilibrium. By employing the spin-wave approximation and functional renormalization group approach, in the weak disorder regime, the three-dimensional driven random field XY model is found to exhibit a quasi-long-range order phase, wherein the correlation function shows power-law decay with a non-universal exponent that depends on the disorder strength. This result is consistent with that reported in a previous numerical study. We further develop a phenomenological theory of the three-dimensional KT transition by taking into account the effect of vortices. The point of this theory is that the cross-section of the system with respect to a plane perpendicular to the driving direction is essentially identical to the two-dimensional pure XY model.

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。

↑