Low-dimensional optoelectronic dynamics in 3D topological insulators

在这个项目中，由于拓扑绝缘体的特殊能带结构，我们将在纳米级电路中实验探索光电流动力学。重点将放在拓扑绝缘体中狄拉克-费米子的极化控制和电子读出上。特别是，将研究一维螺旋态，并对其宏观量子输运有一个基本的了解。此外，超快非平衡光电流将在由拓扑绝缘体组成的纳米线中以时间分辨的方式进行检测。此外，应该实现和探索来自拓扑绝缘体的电路，其横向延伸只有几个纳米。该项目旨在探索将拓扑绝缘体集成到未来的光电子电路和探测器中的新材料和新概念。

In this project, photocurrent dynamics shall be experimentally explored in nanoscale circuits, which result from the specific band structure of topological insulators. An important emphasis will be put on the polarization control and electronic read-out of Dirac-Fermions in topological insulators. In particular, one-dimensional helical states shall be examined, and a fundamental understanding of their macroscopic quantum transport shall be achieved. Moreover, ultrafast non-equilibrium photogalvanic currents shall be examined in nanowires in a time-resolved way, which are made of topological insulators. In addition, circuits from topological insulators shall be realized and explored, which have a lateral extension of just a few nanometers. The project aims at exploring new materials and concepts for integrating topological insulators into future optoelectronic circuits and detectors.