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162. 


Spin valve effect in zigzag graphene nanoribbons by defect engineering



S. Lakshmi, S. Roche, and G. Cuniberti

Physical Review B 80, 193404 (2009)

We report on the possibility for a spin valve effect driven by edge defect engineering of zigzag graphene nanoribbons. Based on a mean-field spin unrestricted Hubbard model, electronic band structures and conductance profiles are derived, using a self-consistent scheme to include gate-induced charge density. The use of an external gate is found to trigger a semiconductor-metal transitionincleanzigzaggraphenenanoribbons, whereasityieldsaclosureof thespin-splitbandgap in the presence of Klein edge defects. These features could be exploited to make novel charge and spin based switches and field effect devices.



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