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Nonequilibrium dynamic transition in a kinetic Ising model driven by both deterministic modulation and correlated stochastic noises

机译:动力学Ising模型的非平衡动态转移   确定性调制和相关随机噪声

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摘要

We report the nonequilibrium dynamical phase transition (NDPT) appearing in akinetic Ising spin system (ISS) subject to the joint application of adeterministic external field and the stochastic mutually correlated noisessimultaneously. A time-dependent Ginzburg-Landau stochastic differentialequation, including an oscillating modulation and the correlated multiplicativeand additive white noises, was addressed and the numerical solution to therelevant Fokker-Planck equation was presented on the basis of an average-periodapproach of driven field. The correlated white noises and the deterministicmodulation induce a kind of dynamic symmetry-breaking order, analogous to thestochastic resonance in trend, in the kinetic ISS, and the reentrant transitionhas been observed between the dynamic disorder and order phases when theintensities of multiplicative and additive noises were changing. Thedependencies of a dynamic order parameter Q upon the intensities of additivenoise A and multiplicative noise M, the correlation lmda between two noises,and the amplitude of applied external field h were investigated quantitativelyand visualized vividly. A brief discussion was given to outline the underlyingmechanism of the NDPT in a kinetic ISS driven by an external force andcorrelated noises. Keywords: Ising spin system, nonequilibrium dynamical phase transition,stochastic resonance, correlated noises, TDGL model. PACS: 75.10.Hk, 64.60.Ht, 05.10.Gg, 76.20.+q
机译:我们报告了动态伊辛自旋系统(ISS)中出现的非平衡动态相变(NDPT),同时受确定性外场和随机相互关联的噪声共同作用。研究了一个时变的Ginzburg-Landau随机微分方程,包括一个振荡调制以及相关的乘性和加性白噪声,并基于驱动场的平均周期方法给出了相关Fokker-Planck方程的数值解。相关的白噪声和确定性调制在动态空间ISS中诱发了一种动态对称破坏阶,类似于趋势中的随机共振,并且当乘性噪声和加性噪声的强度为变化。定量研究了动态阶数参数Q对加性噪声A和乘性噪声M的强度,两个噪声之间的相关性lmda以及所施加的外场h的依赖性,并对其进行了生动的可视化。进行了简短的讨论,概述了由外力和相关噪声驱动的动力ISS中NDPT的基本机制。关键词:Ising自旋系统非平衡动态相变随机共振相关噪声TDGL模型PACS:75.10.Hk,64.60.Ht,05.10.Gg,76.20。+ q

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