Magnetic field modulation of chiral tunneling in graphene heterojunctions

We investigate the effect of the magnetic field on the chiral tunneling of a gated graphene heterojunction by means of the non-equilibrium Green's function method. We find that the angular-dependent transmission profile can be deflected sideways due to the effect of the magnetic field, resulting in a decrease of the overall conductance. In particular, the conductance can be significantly decreased (increased) by an additional magnetic field outside the central region, applied in the positive (negative) orientation. This distinct transport characteristic can be utilized to modulate the magentoresistance of the graphene heterojunction. (paper)