Improving spin-filtering efficiency in graphene and boron nitride nanoribbon heterostructure decorated with chromium-ligand

Abstract

By applying nonequilibrium Green’s functions in combination with density-function theory, we investigate the spin-dependent transport properties of graphene and boron nitride nanoribbon heterostructure decorated with chromium-ligand. In the heterostructure, the graphene and boron nitride nanoribbon are connected in a interlaced way, and the chromium-ligand are decorated above the surface of the graphene nanoribbon. When one boron nitride nanoribbon fragment is embedded in the graphene nanoribbon, the maximum spin-filtering efficiency at finite bias is only about 65%. However, almost 100% spin-filtering efficiency can be observed at low bias when one more BNNR fragment is introduced into the system. Especially, the high spin-filtering efficiency is independent of the magnetic configuration of the device. Our work provides a new thinking to achieve the high-performance spin filter.