论文标题
HGTE量子井中的狄拉克锥体分裂：晶体学取向，界面，散装和结构内不对称的影响
Splitting of Dirac cones in HgTe quantum wells: Effects of crystallographic orientation, interface-, bulk-, and structure-inversion asymmetry
论文作者
论文摘要
我们在$（0LH）$ - 种植的hgte/cdhgte量子井（QWS）中开发了狄拉克状态的精细结构的微观理论，其中$ l $和$ h $是米勒指数。结果表明，散装，界面和结构反转不对称也会引起水平的抗抗验，即使在零面积波矢量下，并提高了狄拉克状态退化。在临界厚度的QW中，两倍的简化狄拉克锥体分为非脱位Weyl锥。分裂和Weyl点位置极大地取决于QW晶体学方向。我们计算与散装，界面和结构反转不对称相关的分裂参数，并得出狄拉克状态的有效哈密顿量。此外，我们获得了能量谱的分析表达，并讨论了（001） - ，（013） - 和（011） - 种植QW的频谱。
We develop a microscopic theory of the fine structure of Dirac states in $(0lh)$-grown HgTe/CdHgTe quantum wells (QWs), where $l$ and $h$ are the Miller indices. It is shown that bulk, interface, and structure inversion asymmetry causes the anticrossing of levels even at zero in-plane wave vector and lifts the Dirac state degeneracy. In the QWs of critical thickness, the two-fold degenerate Dirac cone gets split into non-degenerate Weyl cones. The splitting and the Weyl point positions dramatically depend on the QW crystallographic orientation. We calculate the splitting parameters related to bulk, interface, and structure inversion asymmetry and derive the effective Hamiltonian of the Dirac states. Further, we obtain an analytical expression for the energy spectrum and discuss the spectrum for (001)-, (013)- and (011)-grown QWs.
