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arXiv 0811.1928cond-mat.stat-mech
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具有周期边界驱动的非对称简单排它过程

Asymmetric simple exclusion process with periodic boundary driving

Vladislav Popkov, Mario Salerno, Gunter M. Schutz

摘要:

我们考虑了半无限长链上的非对称简单排斥过程(ASEP),该链在末端耦合到具有随时间周期性变化的粒子密度的水库。它示出的密度分布假设一个时间周期的锯齿状形状。这种形状不依赖于初始条件,并在流体动力学极限中解析地发现。在有限系统中,定态被证明是由有效边界密度和极值通量原理。通过蒙特卡罗模拟数值计算确定了有效边界密度,并与平均场方法和流体力学极限方程Burgers方程的数值积分给出的边界密度进行了比较。我们的研究结果直接延伸到一个保守的粒子物种的一类广泛的驱动扩散系统。

英文摘要:

We consider the asymmetric simple exclusion process (ASEP) on a semi-infinite chain which is coupled at the end to a reservoir with a particle density that changes periodically in time. It is shown that the density profile assumes a time-periodic sawtooth-like shape. This shape does not depend on initial conditions and is found analytically in the hydrodynamic limit. In a finite system, the stationary state is shown to be governed by effective boundary densities and the extremal flux principle. Effective boundary densities are determined numerically via Monte Carlo simulations and compared with those given by mean field approach and numerical integration of the hydrodynamic limit equation which is the Burgers equation. Our results extend straightforwardly beyond the ASEP to a wide class of driven diffusive systems with one conserved particle species.

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