Study on quantum transport properties of graphene Dirac fermions

We studied the graphene Dirac fermions barrier-dependence transport properties by using tight-binding model method. Taking account of graphene Dirac fermions incident angle, incident energy and the barrier height or barrier thickness, we analyzed the graphene Dirac fermions transmission coefficient of the barrier. Theoretical analysis and numerical calculations show that the tunneling coefficient of Dirac fermions in graphene appears a clear oscillation effect with height and thickness of the square barrier varing, and the dependence of tunneling coefficient and incident angle confirms Klein effects. Dirac fermions barrier transmission rate vaies form 0 to 1 with certain parameters as Dirac fermions of the incident energy changes. The change of conductance appears good conductance switching effect, and this effect will have a good application prospect on microelectronic devices.