Abstract
We study adiabatic quantum pumping in bilayer graphene where two-barrierpotentials are weakly modulated as pumping parameters. Comparing the resultswith those for a normal quantum pump of non-chiral quasiparticles, we find thatthe chirality of quasiparticles in bilayer graphene heavily affects the pumpedcurrent through chiral tunnelling. When an exchange splitting induced by theproximity of a ferromagnetic insulator is introduced, the pumped current becomesspin-polarized. It is interesting that an almost 100% polarized charge currentand a pure spin current with vanishing charge current can all be achieved undersuitable conditions. The experimental feasibility and the interlayer asymmetric effectin bilayer graphene caused by the gate and the ferromagnet structures are alsodiscussed. The results are useful for spintronics applications based on graphene.
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