SCALE-INVARIANCE IN BIASED DIFFUSION

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/39363

Title:	SCALE-INVARIANCE IN BIASED DIFFUSION
Authors:	CHEUNG,KW;YU,KW;HUI,PM
Contributors:	物理研究所
Keywords:	HOPPING CONDUCTIVITY;ELECTRIC-FIELD;ONE DIMENSION;SYSTEMS
Date:	1992
Issue Date:	2010-07-08 14:13:28 (UTC+8)
Publisher:	中央大學
Abstract:	We have studied hopping transport on a one-dimensional disordered chain in which the hopping rates are characterized by scale-invariant distributions. As a model for dispersive transport, the distribution contains a large weight of small hopping rates. Emphasis has been placed on the range dependence of the diffusion coefficient D(L) approximately L(-theta) and the frequency dependence of the electrical conductivity sigma(omega) approximately omega(x), with x = theta/(2 + theta), so that comparison with conductivity experiments can be made. In the presence of a biased electric field, the frequency dependence of the conductivity sigma(omega)) is found to cross over from omega(x) (diffusive limit) to omega(y) with y = theta/(1 + theta) (drift limit). The transport exponents are calculated explicitly in terms of the parameters of the distribution. Numerical simulations have also been carried out to confirm the above scaling results. Excellent agreement is found.
Relation:	PHYSICAL REVIEW B
Appears in Collections:	[Graduate Institute of Physics] journal & Dissertation

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