Spin-valve effect in zigzag graphene nanoribbons by defect engineering

Sankaran Lakshmi, Stephan Roche, Gianaurelio Cuniberti
2009 Physical Review B  
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 transition in clean zigzag graphene nanoribbons, whereas it yields a closure of the spin-split bandgap in the presence
more » ... ap in the presence of Klein edge defects. These features could be exploited to make novel charge and spin based switches and field effect devices.
doi:10.1103/physrevb.80.193404 fatcat:7sflwzimr5g3plevwemo2j3uam