Giant Mechanoelectrical Switching in Ferromagnetic Graphene Nanoribbons

Giant mechanoelectrical effect is observed when twisting a ferromagnetic zigzag-edged graphene nanoribbon (ZGNR) with collinear spin configuration from ab initio quantum transport calculations. The resulting switch ratio is up to 10$^{10}${\%} when the ZGNRs are overturned once and can be even enhanced to over 10$^{14}${\%} via multiply overturnings. We find such a switch equivalent to a spin valve without resort to an external magnetic field. Furthermore, consideration under Noncollinear situation is aslo in progress.