含InAs自组装量子点肖特基二极管的关联放电效应

制作了含自组织量子点的金属半导体金属双肖特基势垒器件,研究了器件的电流输运特性.在量子点充放电造成的电流迟滞回路的基础上,观察到了电压扫描过程中的电流由低态到高态的跳跃现象.这种电流跳跃来源于充电量子点的关联放电效应.根据量子点系统的哈密顿量,分析了充电量子点关联放电的原因.这种关联放电效应起源于量子点与2DEG的相互作用,当一个量子点放电时通过量子点和2DEG电流的变化会影响其他的量子点,从而促使其放电,这种过程在整个系统中放大导致所有的量子点放电 关键词： 关联效应 自组装量子点

CORRELATED DISCHARGING OF InAs QUANTUM DOTS IN METAL-SEMICONDUCTOR-METAL STRUCTURE

We report a correlated discharging process in current transport through metal-semiconductor-metal structures containing InAs self-assembled quantum dots.Due to the charged and discharged states of quantum dots,two different current states with a round hysteresis loop are usually observed in our structure.The transitions between the two current states are controlled by the applied voltages.Besides the normal charging and discharging processes,a correlated discharging is observed at 77K.Interactions that relate to the electrons in the quantum dots in the system are considered.The correlated discharging process is attributed to the interaction between electrons in the quantum dots and the conducting two-dimensional electron gas beneath the dot layer.Based on our analysis a simple picture of the relaxation process is given.