Abstract On the basis of the eight-band kp model, the theoretical engineering of HgTe/HgCd(Mn)Te double quantum well (DQW) structures is presented in this study. An external magnetic field and structural inversion asymmetry are taken into account. The advantages of HgTe two-dimensional topological insulator (2D TI) layers with x -Cd or x -Mn over pure 2D TI HgTe films are theoretically and experimentally proven. All advantages, such as the larger Fermi velocity, very high mobility of the surfaces states, the larger g factor for such mixed layers together with the sharpens on the edge layers in the 2D TI structures and the structural inversion asymmetry (which can be easy realized in the 2D DQW case), mean that the presented structures are encouraging as the basis of, for example, high resolution terahertz detectors. Considering this possible application, the optical transition for the cyclotron resonance and the excitation transfer in the terahertz region is analyzed. The results of the presented investigation are very promising for the application of HgTe/HgCd(Mn)Te DQW structures in terahertz detector.

中文翻译：

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具有拓扑相和结构反转不对称性的 HgTe/HgCd(Mn)Te 双量子阱结构中太赫兹区域的光吸收

摘要 本研究以八波段kp模型为基础，提出了HgTe/HgCd(Mn)Te双量子阱(DQW)结构的理论工程。考虑了外部磁场和结构反转不对称性。具有 x -Cd 或 x -Mn 的 HgTe 二维拓扑绝缘体 (2D TI) 层相对于纯 2D TI HgTe 薄膜的优势在理论上和实验上都得到了证明。所有优点，例如较大的费米速度、表面态的非常高的迁移率、这种混合层的较大 g 因子以及 2D TI 结构中边缘层的锐化和结构反转不对称性（这很容易实现）在 2D DQW 情况下），意味着所呈现的结构是令人鼓舞的，例如作为高分辨率太赫兹探测器的基础。考虑到这种可能的应用，分析了回旋共振的光学跃迁和太赫兹区域的激发转移。所提出的研究结果对于 HgTe/HgCd(Mn)Te DQW 结构在太赫兹探测器中的应用非常有希望。