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本文运用顶角的Post-CPA方法研究了无序层状系统的维数跨越效应,层间耦合t的强弱决定了系统的有效维数。对于耦合的临界值tc,Anderson转变发生。我们求出了系统的玻耳兹曼电导率、对应于最大交叉顶角的动力学电导率和直流电导率以及临界点附近的局域长度。In this paper, the crossover effect of the dimensionality in the disordered layer system is studied by using the post-CPA method for the vertex. The effective dimensionality of the system is determined by the interlayer coupling t. It is shown that Anderson transition will occur at the critical value tc. Boltzmann conductivity, the dynamical conductivity corresponding to the maximum crossed diagrams, the d. c. conductivity and the localization length near the critical point are calculated.
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