Single-Valley Engineering in Graphene Superlattices
Materials Science
2015-07-14 v1 Mesoscale and Nanoscale Physics
Abstract
The two inequivalent valleys in graphene preclude the protection against inter-valley scattering offered by an odd-number of Dirac cones characteristic of Z2 topological insulator phases. Here we propose a way to engineer a chiral single-valley metallic phase with quadratic crossover in a honeycomb lattice through tailored \sqrt{3}N *\sqrt{3}N or 3N *3N superlattices. The possibility of tuning valley-polarization via pseudo-Zeeman field and the emergence of Dresselhaus-type valley-orbit coupling are proposed in adatom decorated graphene superlattices. Such valley manipulation mechanisms and metallic phase can also find applications in honeycomb photonic crystals.
Cite
@article{arxiv.1501.05553,
title = {Single-Valley Engineering in Graphene Superlattices},
author = {Yafei Ren and Xinzhou Deng and Changsheng Li and Jeil Jung and Changgan Zeng and Zhenyu Zhang and Qian Niu and Zhenhua Qiao},
journal= {arXiv preprint arXiv:1501.05553},
year = {2015}
}
Comments
5 pages, 3 figures + supplemental materials