Strain controlled valley filtering in multi-terminal graphene structures

Valley-polarizedcurrents can be generated by local straining of multi-terminalgraphene devices. The pseudo-magnetic field created by the deformation allowselectrons from only one valley to transmit, and acurrent ofelectrons from a single valley is generated at the opposite side of the locally strained region. We show that valley filtering is most effective with bumps of a certain height and width. Despite the fact that the highest contribution to the polarizedcurrent comes fromelectrons from the lowest sub-band, contributions of other sub-bands are not negligible and can significantly enhance the outputcurrent.

Source: Applied Physics Letters - November 15, 2016 Category: Physics Authors: S. P. Milovanovi ć and F. M. Peeters Source Type: research