Eur. Phys. J. B 78, 83-86 (2010)
https://doi.org/10.1140/epjb/e2010-10432-2

Supercurrent switching effect in zigzag graphene nanoribbons

¹ National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, P.R. China
² College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, P.R. China

Corresponding author: ^a zpniu@nuaa.edu.cn

Received: 1 June 2010
Revised: 18 August 2010
Published online: 3 November 2010

Abstract

The non-equilibrium Green's function approach is applied to investigate dc Josephson currents in S/ZGNR/S junctions, where ZGNR is the zigzag graphene nanoribbon and S is the s-wave superconductor. If the middle ZGNR is half-metallic ferromagnetic, the supercurrent changes from vanishing to a finite value when the gate voltage is adjusted, exhibiting a supercurrent switching effect.