多散射杂质对二维电子系统输运特性的影响  

Influence of multi-scattering impurities on transport properties of two-dimensional electron systems

作　　者：白志明[1] 马强[1] 

机构地区：[1]河北科技大学理学院,河北石家庄050018

出　　处：《河北科技大学学报》2011年第1期1-7,共7页Journal of Hebei University of Science and Technology

摘　　要：利用散射矩阵理论研究了含有多个矩形散射杂质二维系统中电子输运问题。绝对零度下,电导随入射电子能量增大,呈台阶式上升形式;杂质宽度的减小使得电导的量子化现象增强;杂质长度的增大,使得电导在最初阶段急剧减小,而后呈现周期性振荡;随着散射杂质数量的增加,电导由急剧减小也呈现周期性振荡。温度的升高使得电导台阶倾斜,量子化现象逐渐消失。By using scattering matrix theory,the electron transport in a two-dimensional system containing multi-rectangular scattering impurities is studied.At zero temperature,the conductance shows the quantum phenomena which increases with the increase of electron energy and with the decrease of the width of scattering impurities.The impurity makes the conductance decrease rapidly at its small length,and at large length the conductance shows periodic oscillation.In the multi-scattering system,the conductance no longer decreases rapidly but oscillates with increasing number of scattering impurities.The increase of temperature makes the conductance stages tilt and the quantum phenomena disappear gradually.

关 键 词：杂质 电导量子化 散射矩阵理论 

分 类 号：O469[理学—凝聚态物理] O481.3[理学—电子物理学]