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We present a single barrier system to generate pure valley-polarized currentin monolayer graphene. A uniaxial strain is applied within the barrier region,which is delineated by localized magnetic field created by ferromagneticstripes at the regions boundaries. We show that under the condition of matchingmagnetic field strength, strain potential, and Fermi energy, the transmittedcurrent is composed of only one valley contribution. The desired valley currentcan transmit with zero reflection while the electrons from the other valley aretotally reflected. Thus, the system generates pure valley-polarized currentwith maximum conductance. The chosen parameters of uniaxial strain and magneticfield are in the range of experimental feasibility, which suggests that theproposed scheme can be realized with current technology.

Perfect valley filter in strained graphene with single barrier region