Spin-orbit interaction in HgTe based wires

该项目的重点是介观纳米线的干涉现象，由应变碲化汞，是一个强大的3D拓扑绝缘体（TI）。一方面，我们努力得到额外的证据的拓扑性质的表面状态下最近的理论建议，另一方面，我们计划系统地研究量子力学干涉现象的TI纳米线和环。除了电荷载流子的拓扑性质，这些系统也是有趣的，因为导电表面状态，周围的绝缘体的TI，使新的圆柱形几何形状的介观，很难实现与其他材料。要解决的问题是（一）Aharonov-Bohm振荡和探测相位相干长度的电线和环，（二）寻找狄拉克表面状态的签名磁量子振荡的电线和（三）调查背门样品。后一种技术对于我们在单独的工作包中探索的基于Bi的系统也很重要。

The project focuses on interference phenomena in mesoscopic nanowires made from strained HgTe, being a strong 3D topological insulator (TI). On one hand we strive to get additional proof of the topological nature of the surface states following a recent theoretical proposal and, on the other hand, we plan to investigate systematically quantum mechanical interference phenomena in TI nanowires and rings. Apart from the topological nature of the charge carriers these systems are also insofar interesting as the conducting surface states, surrounding the insulating bulk of a TI, enable new cylindrical geometries for mesoscopics, hardly realizable with other materials. Topics to be addressed are (i) Aharonov-Bohm oscillations and probing phase coherence lengths in wires and rings, (ii) the search for signatures of Dirac surface states in magneto-quantum oscillations of wires and (iii) the investigation of back gated samples. The latter technique is also important for Bi-based systems which we explore in a separate work package.