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arXiv 1409.0967cond-mat.stat-mech
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分形格点上猝灭陷阱模型中的反常扩散

Anomalous diffusion in a quenched-trap model on fractal lattices

Tomoshige Miyaguchi, Takuma Akimoto

摘要:

具有异常亚扩散混合源的模型对于理解生物系统中的输运被认为是重要的。在这里,这样的混合模型,淬火陷阱模型(QTM)的分形晶格,进行了研究。结果表明,无论是合奏和时间平均均方位移(MSD)显示子扩散与不同的标度指数,即,该系统表现出弱遍历性破缺。此外,时间平均的MSD表现出老化和收敛到一个随机变量以下的修改Mittag-Leffler分布。当分形格的谱维数小于2时,分形格上的QTM不能化为连续时间的随机游动。

英文摘要:

Models with mixed origins of anomalous subdiffusion have been considered important for understanding transport in biological systems. Here, one such mixed model, the quenched trap model (QTM) on fractal lattices, is investigated. It is shown that both ensemble- and time-averaged mean square displacements (MSDs) show subdiffusion with different scaling exponents, i.e., this system shows weak ergodicity breaking. Moreover, time-averaged MSD exhibits aging and converges to a random variable following the modified Mittag--Leffler distribution. It is also shown that the QTM on a fractal lattice can not be reduced to the continuous-time random walks, if the spectral dimension of the fractal lattice is less than 2.

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