多量子阱系统结构变化对共振隧穿的影响

通过求解薛定谔方程得到由N个矩形势垒构成的量子阱系统的传输矩阵和电子透射系数的精确解，研究了多量子阱系统中势垒宽度、势阱宽度和势阱个数对电子共振隧穿的影响．数值分析表明，对于中间垒宽为两侧垒宽之和的对称多量子阱，阱宽的增加引起共振峰向能量低的方向移动，共振峰个数增加；势阱个数增加不影响共振峰个数及其位置，但可以获得透射比更大、更尖锐的共振峰．

Effects of the structure on resonant tunneling in multi-quantum-well systems

The transfer matrix and transmission coefficient of electron tunneling through a quantum system consisting of N rectangular barriers and wells and the number of wells on electron resonant tunneling are studied in multi-quantum-well systems. Numerical analysis shows that for the symmetrical multi-quantum-well systems in which the widths of middle barriers are equal to the sum of the widths of two side barriers, the resonant energy is decreased and the number of th resonant peaks is increased with the increase in widths of the wells; the number of the resonant peaks and the resonant energy do not change and the transmission ratio of peak to vale is increased with the increase in the number of the wells.