多散射杂质对二维电子系统输运特性的影响-河北科技大学学报.PDFVIP

32 1 Vol. 32, No. 1 2011 2 Journal of Hebei University of Science and T echnology eb.2011 : 1008-1542( 2011) 01-0001- 07 白志明, 马 强 ( 河北科技大学理学院, 河北石家庄 050018) : 利用散射矩阵理论研究了含有多 个矩形散射杂质二维系 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 : 杂质; 电导量子化;散射矩阵理论 : O469; O481. 3 :A Influence of mult-i scattering impurities on transport properties of two-dimensional electron systems BAI Zh-i ming, MA Qiang ( College of Sciences, Hebei University of Science and T echnology, Shijiazhuang Hebei 050018, China) Abstract: By using scattering matrix theory, the electron transport in a tw o-dimensional system containing multi-rectangular scattering impurities is studied. At zero temperature, the conductance show s t he quantum phenomena which increases w ith the increase of electron energy and w ith the decrease of the w idth of scattering impurities. T he impurity makes t he conductance de- crease rapidly at its small length, and at large length the conduct ance show s periodic oscillat ion. In the mult-i scattering system, the conductance no longer decreases rapidly but oscillat es w ith increasing number of scattering im purities. The increase of tem- perature makes the conduct ance stages tilt and the quantum phenomena disappear gradually. Key words: impurity; conductance quantization; scattering matrix theory , , , [ 1-9] , , , , , ( , , , ) , , , , , , , , , [ 10- 12] , : 2010-05-07; : 2010- 09-21; : : ( 1962- ) , , , , , 2