Strain controlled valley filtering in multi-terminal graphene structures

Abstract

Valley-polarized currents can be generated by local straining of multi-terminal graphene devices. The pseudo-magnetic field created by the deformation allows electrons from only one valley to transmit and a current of electrons 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 polarized current comes from electrons from the lowest sub-band, contributions of other sub-bands are not negligible and can significantly enhance the output current.

4 pages, 4 figures

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• Electronic transport in bent carbon nanotubes
• Complex Landau levels and related transport properties in the strained zigzag graphene nanoribbons
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• Weyl Semimetal Path to Valley Filtering in Graphene
• Switching valley filtered current directions in multi-terminal graphene systems
• Detecting Strain Effects due to Nanobubbles in Graphene Mach-Zehnder Interferometers
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