OPTICAL TRANSITION ENERGIES FOR LEAD-SALT SEMICONDUCTOR QUANTUM WELLS
OPTICAL TRANSITION ENERGIES FOR LEAD-SALT SEMICONDUCTOR QUANTUM WELLS
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DOI：
10.1103/physrevb.60.8859
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发表时间：
1999-09
影响因子：
3.7
通讯作者：
Erasmo A. de Andrada e Silva
中科院分区：
文献类型：
--
作者：
Erasmo A. de Andrada e Silva
用解析方法计算了生长在（100）和（111）衬底上的铅盐半导体量子威尔斯阱中电子和空穴的量子化态及其相应的电偶极光学跃迁能。在包络函数逼近内并使用Dimmock两波段$\stackrel{\ensuremath{\rightarrow}}{k}\ensuremath{\cdot}\stackrel{\ensuremath{\rightarrow}}{p}$模型为散装。该解决方案考虑到非抛物性，各向异性，谷和自旋简并，由于量子限制的突破。不同的碲化铅量子阱的，作为温度和阱宽的函数计算的过渡能，给出了一个公平的描述的观察文献中报道的量子尺寸效应。球近似和抛物线近似的铅盐量子阱的电子结构的限制是明确的，并推导出有效哈密顿量中的Rashba自旋轨道项。
The quantized states for electrons and holes confined in lead-salt semiconductor quantum wells (QW's) grown on (100) and (111) substrates and the corresponding electric-dipole optical transition energies are calculated analytically, within the envelope function approximation and with the Dimmock two-band $\stackrel{\ensuremath{\rightarrow}}{k}\ensuremath{\cdot}\stackrel{\ensuremath{\rightarrow}}{p}$ model for the bulk. The solution takes into account nonparabolicity, anisotropy, and break of valley and spin degeneracy, due to quantum confinement. Transition energies for different PbTe QW's, calculated as a function of temperature and well width, are shown to give a fair description of the observations of the quantum size effect reported in the literature. Limitations of the spherical and of the parabolic approximations to the electronic structure of the lead-salt QW's are made clear and the Rashba spin-orbit term in the effective Hamiltonian is derived.