摘要
研究了电场、磁场作用下,二维无序杂质系统电导的物理性质.电场的作用削弱了系统电导的"台阶"量子效应,随着中间散射区域尺寸的增大,系统电导随电子能量的变化振荡加剧;系统电导随着磁场的变化表现出周期性振荡行为,其振荡的剧烈程度随外部电压的增大而变小;受杂质散射的影响,系统电导随无序杂质质量分数的增大而减小.
On the action of electric field and magnetic field,the phenomenon of quantized conductance in a two-dimensional system with disordered impurities is investigated. The electric field decreases the conductance and reduced its＂step＂quantum effect. The increase of the size of the intermediate scattering area intensifies the oscillation of the conductance varying with the electron energy. The conductance exhibits periodic oscillation with the external magnetic field, and the intensity of the oscillation becomes smaller with the increase of the electric field. With the increase of the impurity concentration, the conductance decreases.
作者
刘龙
孙素涛
白志明
LIU Long SUN Sutao BAI Zhiming(Sciences School, Hebei University of Technology, Hebei Shijiazhuang 050018,China Mechanical and Electrical Engineering Department, Shijiazhuang Science and Information Vocational College, Hebei Shijiazhuang 050000, China)
出处
《河北师范大学学报（自然科学版）》
CAS
2017年第2期127-133,共7页
Journal of Hebei Normal University：Natural Science
关键词
紧束缚近似
格林函数
电场
无序杂质
tight binding approximation
Green ＇s function
electric field
disordered impurity
