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We investigate a novel way to manipulate the spin polarized transmission in atwo terminal zigzag graphene nanoribbon in presence of Rashba spin-orbit (SO)interaction with circular shaped cavity engraved into it. A usual technique tocontrol the spin polarized transport behaviour of a nanoribbon can be achievedby tuning the strength of the SO coupling, while we show that an efficientengineering of the spin polarized transport properties can also be done viacavities of different radii engraved in the nanoribbon. Simplicity of thetechnique in creating such cavities in the experiments renders an additionalhandle to explore transport properties as a function of the location of thecavity in the nanoribbon. Further, a systematic assessment of the interplay ofthe Rashba interaction and the dimensions of the nanoribbon is presented. Theseresults should provide useful input to the spintronic behaviour of suchdevices. In addition to the spin polarization, we have also included aninteresting discussion on the charge transmission properties of the nanoribbon,where, in absence of any SO interaction a metal-insulator transition induced bythe presence of a cavity is observed.

Controlled engineering of spin polarized transport properties in a zigzag graphene nanojunction