By using four-terminal configurations, we investigated the dependence of longitudinal and diagonal resistances of a graphene p-n interface on the quantum-Hall edge-state equilibration position. The resistance of a p-n device in our four-terminal scheme is asymmetric with respect to the zero point where the filling factor (ν) of the entire graphene vanishes. This resistance asymmetry is caused by the chiral-direction-dependent change of the equilibration position and leads to a deeper insight into the equilibration process of the quantum-Hall edge states in a bipolar graphene system.
@article{arxiv.0912.2791,
title = {Dependence of quantum-Hall conductance on the edge-state equilibration position in a bipolar graphene sheet},
author = {Dong-Keun Ki and Seung-Geol Nam and Hu-Jong Lee and Barbaros Oezyilmaz},
journal= {arXiv preprint arXiv:0912.2791},
year = {2012}
}