Rashba splitting in MIS structures HgCdTe
Rashba splitting in MIS structures HgCdTe
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DOI：
10.1134/1.1513822
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发表时间：
2002-09
影响因子：
1.1
通讯作者：
V. Radantsev;A. Yafyasov
中科院分区：
文献类型：
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作者：
V. Radantsev;A. Yafyasov
将基于hgcdte的正、负Kane间隙的MIS结构的自旋轨道光谱分裂的测量参数与使用三波段和四波段Kane模型计算的参数进行了比较。在计算中忽略价带的有限自旋-轨道分裂Δ会导致Rashba分裂的值被夸大（特别是forEg< 0），即使对于小的比率|Eg|/Δ，尽管在相同浓度的二、三、四波段Kane近似中光谱的两个自旋分支上的子带参数平均值实际上是相同的。在零隙HgCdTe中，测量值和计算值都明显较高，但四波段近似导致两种材料的劈裂值都比实验值低20-40%。包含带间相互作用可以减少这些差异，但不能完全消除它们。结果表明，分析中常用的准动量线性自旋-轨道分裂二维谱的近似可以使有效Rashba参数降低2-4倍。
The measured parameters of spin-orbit spectral splitting in HgCdTe-based MIS structures with positive and negative Kane gapEgare compared with the parameters calculated using the three-and four-band Kane model. The disregard of the finite spin-orbit splitting Δ of the valence band in calculations leads to exaggerated values of Rashba splitting (especially forEg< 0) even for small ratios |Eg|/Δ, although the subband parameters averaged over two spin branches of the spectrum in the two-, three-, and four-band Kane approximations for the same concentrations are practically identical. In the zero-gap HgCdTe, the measured as well as calculated values are noticeably higher, but the four-band approximation leads to values of splitting for both materials which are 20–40% lower than the experimental value. The inclusion of the interband interaction reduces these discrepancies, but does not eliminate them completely. It is shown that the approximations of the 2D spectrum with spin-orbit splitting linear in quasimomentum, which are conventionally used in the analysis, may lower the effective Rashba parameter by a factor of 2–4.