由于 p-GaAs 量子阱的价带色散关系存在负有效质量区域 ,导致空穴速度 - 电场曲线具有负微分速度特性 . 本文采用非抛物平衡方程理论计算得到了量子阱空穴的 “ N”形速度与电场关系 , 并首次给出了拟合得到的解析表达式 . 计算中 ,考虑了空穴 - 杂质散射 ,空穴 - 声学声子散射和空穴 - 光学声子散射等散射机制 ,讨论了晶格温度对速度 - 电场关系的影响 .
There is a negative-effective－mass (NEM) section in the hole energy dispersion relation for the ground subband of p－quantum－well (QW). We present a model calculation of velocity－field characteristics of holes with a NEM dispersion relation, by using nonparabolic balance－equation theory with a realistic treatment of the scatterings by hole－impurity, hole－acoustic phonon, hole－polar－optic－phonon, and hole－nonpolar－optic－phonon interactions. A “ N－shaped” velocity－field relation is yielded, which is quite different from the two－valley result for electrons in bulk GaAs. An analytical expression for the “ N－shaped” curve is obtained for the first time. The dependence of velocity－ field relation on lattice temperature is also discussed.
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