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We consider tunneling transport between two parallel graphene sheets whereone is a single-layer sample and the other one a bilayer. In the presence of anin-plane magnetic field, the interplay between combined energy and momentumconservation in a tunneling event and the distinctive chiral nature of chargecarriers in the two systems turns out to favor tunneling of electrons from oneof the two valleys in the graphene Brillouin zone. Adjusting the field strengthenables manipulation of the valley polarization of the current, which reachesits maximum value of 100% concomitantly with a maximum of the tunnelingconductance.

Valley filter from magneto-tunneling between single and bi-layer graphene