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arXiv 0911.5280cond-mat.stat-mech
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长程跳跃非对称排斥过程中的杂质诱导激波

Impurity-induced shocks in the asymmetric exclusion process with long-range hopping

J. Szavits-Nossan, K. Uzelac

摘要:

我们认为完全不对称的简单排斥过程(TASEP)的周期链中存在一个单一的杂质网站,是无法访问的其他粒子,因此作为一个静态的缺陷。允许粒子在右边前进任意距离l \geq 1,其概率为l^-(1+sigma),其中sigma > 1。尽管跳跃的范围很长,我们发现相同类型的相变,发生在标准的短距离TASEP与缺陷的网站,缺陷诱导宏观冲击在稳态。特别地,我们的模型显示了具有缺陷位置的短程TASEP的两个主要特征:激波宽度随系统尺寸L的增长为L^(1/2)或L^(1/3),取决于粒子-空穴对称性的存在,以及激波相密度分布的幂律衰减。然而,不同于在短程情况下的配置文件,我们发现,后者是很好地再现的平均场近似,这使我们能够推导出解析表达式的σ依赖指数nu = sigma-1的幂律衰减和点sigma_c = 4/3的过渡发生。

英文摘要:

We consider the totally asymmetric simple exclusion process (TASEP) on the periodic chain in the presence of a single impurity site that is inaccessible to other particles and therefore acts as a static defect. Particles are allowed to advance any distance l \geq 1 on the right with the probability that decays as l^-(1+sigma), where sigma > 1. Despite the long range of hopping, we find the same type of phase transition that occurs in the standard short-range TASEP with a defect site where defect induces a macroscopic shock in the stationary state. In particular, our model displays two main features characteristic of the short-range TASEP with defect site: a growth of the shock width with system size L as L^(1/2) or L^(1/3), depending on the existence of the particle-hole symmetry, and the power-law decay in density profiles of the shock phase. However, unlike the profiles in the short-range case, we find that the latter are well reproduced by the mean-field approximation, which enables us to derive the analytical expression for sigma-dependent exponent nu = sigma-1 of this power-law decay and the point sigma_c = 4/3 at which the transition takes place.

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