Conductance spin-polarization filter in monolayer graphene with combined magneto-electric modulation

We have theoretically investigated the conductance and the conductance spin-polarization (P_G) with combined magneto-electric potential structure in monolayer graphene. The results show that P_G could be enhanced and hence reach maximum (P_G±=±1) no matter which one of the four barrier parameters is increased. These four barrier parameters are the intensity (β) and the width (w) of the magnetic barriers, the intensity (U) and the width (b) of the potential barriers. The above results indicate that it is easy to realize the spin filtering. The peak value of the conductance and its corresponding energy could be controlled by adjusting the corresponding four barrier parameters. Additionally, switching effect and low energy spin-up injection could be realized in the structure under certain specific conditions.