Effect of the ferromagnetic stripe on the valley-dependent electron transport properties in graphene

Abstract:

The graphene nanostructure model under the joint modulation of ferromagnetic stripes and hard barriers is established. The effects of the magnitude of magnetic field generated by ferromagnetic stripes and the width of ferromagnetic stripes on the valley-dependent electron transport properties in graphene are calculated, and the electron conductance and the valley polarization in the graphene nanostructure are studied. The numerical results show that the significant valley polarization effect can be realized in such a nanostructure, and the strength of the magnetic field and the width of the ferromagnetic stripes will have a great influence on the electron conductance and valley polarization. Therefore, the valley polarization intensity actually required can be obtained by controlling the width of the ferromagnetic stripes and the strength of the magnetic field generated by it. This study is very helpful for understanding and designing valleytronic devices.