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arXiv 1104.4050cond-mat.stat-mech
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弹道输运和扩散输运之间的交叉:量子排斥过程

Crossover between ballistic and diffusive transport: The Quantum Exclusion Process

Viktor Eisler

摘要:

研究了在相干隧穿和随机马尔可夫噪声同时作用下一维自由费米子系统的演化。我们确定了一类噪声项,其中出现了一个层次的解耦方程的关联函数。在非相干的特殊情况下,最近邻跳跃的两点函数的方程明确解决。格林函数的颗粒密度得到解析和时间尺度确定的交叉从弹道扩散行为发生。结果可以解释为两种类型的传导通道之间的竞争,其中扩散在大的时间尺度上占主导地位。

英文摘要:

We study the evolution of a system of free fermions in one dimension under the simultaneous effects of coherent tunneling and stochastic Markovian noise. We identify a class of noise terms where a hierarchy of decoupled equations for the correlation functions emerges. In the special case of incoherent, nearest-neighbour hopping the equation for the two-point functions is solved explicitly. The Green's function for the particle density is obtained analytically and a timescale is identified where a crossover from ballistic to diffusive behaviour takes place. The result can be interpreted as a competition between the two types of conduction channels where diffusion dominates on large timescales.

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