CAJ | 학술논문

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.
운용Keldysh격림함수,이론연구료재광학빙작용하적량개우합양자점적전자수운성질.발현료전류-전압곡선상적평태결구이급투사계수적공진봉,가이유양자점적국역태밀도래해석.토론료광학빙적빈솔이급강도대계통수운성질적영향,발현당광학빙적빈솔등우공혈적분립능급시,발생전자적동역학국역화.저개결과가이용래실현광학공제개관.
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.