Transport Properties of Two Coupled Quantum Dots Under Optical Pumping  

光学泵作用下两个耦合量子点的输运性质(英文)

作　　者：葛传楠[1] 温俊[1] 彭菊[1] 王伯根[1] 

机构地区：[1]南京大学物理系固体微结构国家实验室,南京210093

出　　处：《Journal of Semiconductors》2006年第4期598-603,共6页半导体学报（英文版）

基　　金：国家自然科学基金资助项目(批准号:90303011,10474034,60390070)~~

摘　　要：Using the Keldysh-Green function,we present a theoretical study on the electron transport properties of two coupled quantum dots under optical pumping. Plateaus in the I-V curve and resonant peaks in the transmission coefficient occur and can be explained by the local electron density of states in the quantum dots. The effects of the optical pumping frequency and intensity on the transport properties of the system are also discussed. The electron dynamical localization phenomenon occurs when the optical pumping frequency is equal to the discrete hole energy level. This result can be used to realize optical control switches.运用Keldysh格林函数,理论研究了在光学泵作用下的两个耦合量子点的电子输运性质.发现了电流电压曲线上的平台结构以及透射系数的共振峰,可以由量子点的局域态密度来解释.讨论了光学泵的频率以及强度对系统输运性质的影响,发现当光学泵的频率等于空穴的分立能级时,发生电子的动力学局域化.这个结果可以用来实现光学控制开关.

关 键 词：Keldysh-Green function optical pumping quantum dot electron transport dynamical localization 

分 类 号：O471.1[理学—半导体物理]