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arXiv 0902.2762cond-mat.stat-mechcond-mat.dis-nn
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弱无序系统中的强迁移性

Strong Mobility in Weakly Disordered Systems

E. Ben-Naim, P. L. Krapivsky

摘要:

研究了弱无序介质中相互作用粒子的输运问题。我们的一维系统包括(i)无序:控制两个相邻晶格位置之间粒子运动的跳跃率是不均匀的,以及(ii)硬核相互作用:每个位置的最大占有率是一个粒子。我们发现,在一个实质性的制度,均方根位移的粒子,σ,超扩散增长与时间t,σ ~(t)^{2/3},其中是无序强度。在没有无序的情况下,粒子位移是亚扩散的,σ ~ t^{1/4},因此无序显著地增强了粒子的迁移率。我们解释了这种效应使用缩放参数,并通过数值模拟验证了理论预测。此外,模拟表明,无序通常会导致更强的流动性。

英文摘要:

We study transport of interacting particles in weakly disordered media. Our one-dimensional system includes (i) disorder: the hopping rate governing the movement of a particle between two neighboring lattice sites is inhomogeneous, and (ii) hard core interaction: the maximum occupancy at each site is one particle. We find that over a substantial regime, the root-mean-square displacement of a particle, sigma, grows super-diffusively with time t, sigma ~ (epsilon t)^{2/3}, where epsilon is the disorder strength. Without disorder the particle displacement is sub-diffusive, sigma ~ t^{1/4}, and therefore disorder dramatically enhances particle mobility. We explain this effect using scaling arguments, and verify the theoretical predictions through numerical simulations. Also, the simulations show that disorder generally leads to stronger mobility.

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。

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