Graphene valley filter using a line defect

Abstract

With its two degenerate valleys at the Fermi level, the band structure of graphene provides the opportunity to develop unconventional electronic applications. Herein, we show that electron and hole quasiparticles in graphene can be filtered according to which valley they occupy without the need to introduce confinement. The proposed valley filter is based on scattering off a recently observed line defect in graphene. Quantum transport calculations show that the line defect is semitransparent and that quasiparticles arriving at the line defect with a high angle of incidence are transmitted with a valley polarization near 100%.

5 pages, 4 figures

References in corpus (6)

• Electric Field Effect in Atomically Thin Carbon Films
• Ultrahigh electron mobility in suspended graphene
• Valley filter and valley valve in graphene
• Electronic transport in polycrystalline graphene
• Topological Defects in Graphene: Dislocations and Grain Boundaries
• Cones, pringles, and grain boundary landscapes in graphene topology

Cited by in corpus (1)

• Revealing the grain structure of graphene grown by chemical vapor deposition