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arXiv 0801.0531cond-mat.dis-nn
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极端无序状态下的交流跳跃导电发生在团簇上

Ac hopping conduction at extreme disorder takes place on the percolating cluster

Thomas B. Schrøder, Jeppe C. Dyre

摘要:

随机势垒模型的模拟表明,交流电流在极端无序进行几乎完全由微团簇略高于阈值,从而与传统理论相矛盾的贡献,从孤立的低活化能集群是可以忽略不计的。有效介质近似结合亚历山大-奥巴赫猜想导致一个很好的分析适合的通用交流电导率没有平凡的拟合参数。

英文摘要:

Simulations of the random barrier model show that ac currents at extreme disorder are carried almost entirely by the percolating cluster slightly above threshold; thus contradicting traditional theories contributions from isolated low-activation-energy clusters are negligible. The effective medium approximation in conjunction with the Alexander-Orbach conjecture leads to an excellent analytical fit to the universal ac conductivity with no nontrivial fitting parameters.

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