Transport in dissipationless one dimensional topological conductors

本模块将重点研究HgTe量子阱和石墨烯中的边态传输，这两个例子是狄拉克哈密顿实验实现的两个典型例子。虽然这两个系统的态密度都产生了狄拉克锥，但材料在拓扑上是不同的，因为在石墨烯中添加的山谷简并将系统从单一的狄拉克锥构型改变为双狄拉克锥构型。本单元的目标是评估这两个狄拉克结构在运输性质上的相似和不同。此外，该模块的目的是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输运的方法，以及Richter小组发展的理论思想，最后，基于在这些研究中获得的知识，确定这些系统在器件应用中的潜力。

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.