带有AB环的T型结构中的电子输运性质  

Electron transport property in T-shape structure with Aharonov-Bohm rings

作　　者：赵志云[1] 许田[1] 兰燕娜[1] 周朋霞[1] 

机构地区：[1]南通大学理学院,江苏南通226007

出　　处：《量子电子学报》2010年第3期356-360,共5页Chinese Journal of Quantum Electronics

基　　金：南通大学引进人才科研启动基金(03080047)资助项目

摘　　要：采用一维量子波导理论研究了带有AB环的类T型结构中的电子输运。在满足波函数连续性以及电流闭合性的情况下,得出了透射系数的解析表达式,并根据此表达式分析了电子的输运特性。结果显示:左右端的透射系数随磁通的变化产生典型的AB振荡。当改变中间入射点的位置X时,左出射端透射系数的大小随之改变,右输出端除φ/φ_0=±n(n=0,1,2,…)附近外,均产生与磁通无关的全反射现象。入射点位置X的变化对透射系数的影响出现一种周期性的调制现象。体系结构轻微的偏离对系统的输运特性影响不大。Based on one-dimensional quantum waveguide theory for mesoscopic structures, the electron transport properties in T-shape structure with Aharonov-Bohm rings are investigated. In the case of ensuring continuity of wavefunction and closing of the current at an intersection, the analytic expression of transmission coefficient are derived and transmission properties are analysed. It is found that the trans- mission coefficient of both sides shows typical AB oscillations with the change of magnetic flux. Altering the incident point of electron, the value of left transmission coefficient also changes, the right transmission coefficient appears total reflection phenomenon which has nothing to do with magnetic flux, but for in the vicinity of values Ф/Ф0=±n（n=0,1,2,…）. The location of the incident point cause periodic modulation of the transmission coefficient. Minor deviation from the structure of the system has little effect on transport properties.

关 键 词：光电子学 量子波导理论 AB环 电子输运 

分 类 号：O469[理学—凝聚态物理]