中国物理B ›› 2006, Vol. 15 ›› Issue (9): 2120-2124.doi: 10.1088/1009-1963/15/9/036
• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇 下一篇
王长, 张拥华
Wang Chang(王长)† and Zhang Yong-Hua(张拥华)
摘要: We have studied the quantum transport of electrons in a three-step single-barrier AlGaAs heterostructure under electric field. Using the quantum transmitting boundary method and Tsu--Esaki approach, we have calculated the transmission coefficient and current--voltage characteristic. The difference of the effective mass among the three barriers is taken into account. Effects of the barrier width on transmission coefficient and peak-to-valley current ratios are examined. The largest peak-to-valley current ratio is obtained when the ratio of widths of the left, middle, and right barrier is fixed at 4:2:1. The calculated results may be helpful for designing devices based on three-step barrier heterostructures.
中图分类号: (Phonon states and bands, normal modes, and phonon dispersion)