Graphene-based heterojunction between two topological insulators
Abstract
Quantum Hall (QH) and quantum spin Hall (QSH) phases have very different edge states and, when going from one phase to the other, the direction of one edge state must be reversed. We study this phenomena in graphene in presence of a strong perpendicular magnetic field on top of a spin-orbit (SO) induced QSH phase. We show that, below the SO gap, the QSH phase is virtually unaffected by the presence of the magnetic field. Above the SO gap, the QH phase is restored. An electrostatic gate placed on top of the system allows to create a QSH-QH junction which is characterized by the existence of a spin-polarized chiral state, propagating along the topological interface. We find that such a setup naturally provides an extremely sensitive spin-polarized current switch.
Keywords
Cite
@article{arxiv.1201.5044,
title = {Graphene-based heterojunction between two topological insulators},
author = {Oleksii Shevtsov and Pierre Carmier and Cyril Petitjean and Christoph Groth and David Carpentier and Xavier Waintal},
journal= {arXiv preprint arXiv:1201.5044},
year = {2012}
}
Comments
10 pages, 5 figures