Transverse current response in armchair graphene ribbons

Authors

Junfeng Liu, Peking University, Beijing, China
Zhongshui Ma, Peking University, Beijing, ChinaFollow
Chao Zhang, University of WollongongFollow

RIS ID

38787

Publication Details

Liu, J., Ma, Z. and Zhang, C. (2011). Transverse current response in armchair graphene ribbons. Journal of Applied Physics, 110 (3), 034313-1-034313-5.

Abstract

We demonstrate that the direction of transverse current in graphene nanoribbons under a magnetic field can be tuned with a gate voltage. It is shown that for armchair ribbons there exist extra energy regions where the direction of the Hall current can be switched between positive and negative values. The directional change of the Hall current coincides with the special points where the two lowest energy bands in the spectrum become degenerate (band crossing points). The number of such degenerate points depends on the width of the ribbons. The dependence of the sign reversal on the gate voltage provides a mechanism for tuning transverse response in graphene based devices.