We systematically investigate the magnetic and electronic properties of graphene adsorbed with diluted 3d-transition and noble metal atoms using first principles calculation methods. We find that most transition metal atoms (i.e. Sc, Ti, V, Mn, Fe) favor the hollow adsorption site, and the interaction between magnetic adatoms and \pi-orbital of graphene induces sizable exchange field and Rashba spin-orbit coupling, which together open a nontrivial bulk gap near the Dirac points leading to the quantum-anomalous Hall effect. We also find that the noble metal atoms (i.e. Cu, Ag, Au) prefer the top adsorption site, and the dominant inequality of the AB sublattice potential opens another kind of nontrivial bulk gap exhibiting the quantum-valley Hall effect.
@article{arxiv.1108.6235,
title = {Magnetic and Electronic Properties of Metal-Atom Adsorbed Graphene},
author = {Jun Ding and Zhenhua Qiao and Wanxiang Feng and Yugui Yao and Qian Niu},
journal= {arXiv preprint arXiv:1108.6235},
year = {2011}
}
Comments
Submitted to PRL on Aug. 10, 2011. 11 pages(4.5 pages for the main text and 6.5 pages for the supporting materials)