多量子点接触中静电势对电子输运的调制  

The influence of electrostatic potential on multi-quantum-contact systems in electron transport

作　　者：吴海强[1] 郭华忠[1] 

机构地区：[1]四川大学物理科学与技术学院,成都610064

出　　处：《四川大学学报（自然科学版）》2014年第6期1223-1228,共6页Journal of Sichuan University(Natural Science Edition)

基　　金：国家自然科学基金重点项目(11234009);国家科技支撑计划课题(20-1125ZCKF)

摘　　要：本文对动态量子点驱动的通过三个量子点接触的电子输运的静电调制效应进行了研究.通过对栅极施加不同电压形成不同的量子点接触静电势,从而改变动态量子点的形状.随着栅极电压的改变,电子库中的费米能也会随之改变,同时,影响下一个量子点接触的静电势垒的梯度.实验证明,量子点接触的电势并不总是阻碍电子输运.电势的调制能够帮助我们了解电子与电子之间的库伦阻塞效应.We present a comprehensive study of the effects of the electrostatic potential modulation on e- lectron transport driven by dynamic quantum dots （QDs） through three pairs of quantum point contacts （QPCs）. Different QPC static potentials can be achieved by changing gate voltage to resize the moving QDs. The Fermi level of electrons in reservoir is modulated, which alters the maximum gradient of the next potential. The experiments observed that the QPC potential does not always act as an obstacle to e- lectron transport, and the potential modulation could help us to understand the electron-electron correla- tion due to Coulomb interactions.

关 键 词：量子点 量子点接触 声电电流 声表面波 

分 类 号：O488[理学—固体物理]