等能谷间杂质散射对无序层状系统电导率的影响

本文研究了等能谷间杂质散射对无序层状系统电导率的影响,求得了依赖于平面间耦合t的系统的有效维数的电导率修正。并且发现在计及等能谷间杂质散射时,电导率修正比只考虑谷内杂质散射时小一半,我们研究了层伏系统从二维过渡到三维的跨越维数效应,发现跨越行为依赖于谷间散射时间τ′,当t<1/τ(τ₀/τ′)^1/2时,系统具有二维行为,反之系统具有三维特征。 关键词：

THE INFLUENCE OF INTERVALLEY IMPURITY SCATTERING ON THE CONDUCTIVITIES OF THE DISORDERED LAYER SYSTEM

This paper studies the influence of intervally impurity scattering on the condu-ctivities of the disordered layer system. The corrections of the conductivities for the effective dimensionality in the system which depend on the interlayer coupling t are obtained. It is found that the corrections of the conductivities including the intervalley impurity scattering is half as large as those which only involving the intravalley scattering. The crossover effect of dimensionality from 2-D to 3-D in the system have been studied. It is shown that the crossover behaviour depend onthe relaxation time due to the intervalley scattering τ′. For t<1/τ((τ₀)/(τ′))^1/2, the sys-tern behave as a two dimensional one, for t> 1/τ((τ₀)/(τ′))^1/2 the system behave as thoughit were a 3-D one.