Conduction mechanism studies on electron transfer of disordered system

来源期刊：中南大学学报(英文版)2002年第2期

论文作者：徐慧 宋祎璞 李新梅

文章页码：134 - 137

Key words：disordered system; localized state; electron transfer; D.C. conductivity

Abstract: Using the negative eigenvalue theory and the infinite order perturbation theory, a new method was developed to solve the eigenvectors of disordered systems. The result shows that eigenvectors change from the extended state to the localized state with the increase of the site points and the disordered degree of the system.When electric field is exerted, the electrons transfer from one localized state to another one. The conductivity is induced by the electron transfer. The authors derive the formula of electron conductivity and find the electron hops between localized states whose energies are close to each other, whereas localized positions differ from each other greatly. At low temperature the disordered system has the character of the negative differential dependence of resistivity and temperature.