Transport in dissipationless one dimensional topological conductors

本单元将重点研究碲化汞量子威尔斯和石墨烯中的边缘态输运，这是狄拉克哈密顿量实验实现的两个典型例子。虽然这两个系统的态密度产生狄拉克锥，但材料在拓扑上不同，因为石墨烯中增加的谷简并性将系统从单狄拉克锥配置改变为双狄拉克锥配置。该模块的目标是评估这两种狄拉克形成所产生的输运性质的相似性和差异。此外，该模块旨在研究基于铁磁接触的石墨烯边缘系统中实现和检测自旋极化传输的方法，以及Richter小组开发的理论思想，最后，基于这些研究中获得的知识，确定这些系统在设备应用中的潜力。

This module will focus on the study of edge state transport in HgTe quantum wells as well as in graphene, the two prototypical examples of the experimental implementation of Dirac Hamiltonians. While the density of states of both these systems yields a Dirac cone, the materials are topologically different in that the added valley degeneracy in graphene changes the system from a single to a double Dirac cone configuration. The goals of this module are to assess the similarities and differences in the transport properties which are engendered by these two Dirac formations. Moreover, the module aims to study means of realizing and detecting spin polarized transport in graphene based edge systems based on the use of Ferromagnetic contacts, and the theoretical ideas developed by the Richter group, and finally, based on the knowledge gained in these studies, to determine the potential of these systems for device applications.