Helical scattering and valleytronics in bilayer graphene
arXiv:1007.4594 · doi:10.1103/PhysRevB.82.165409
Abstract
We describe an angularly asymmetric interface-scattering mechanism which allows to spatially separate the electrons in the two low-energy valleys of bilayer graphene. The effect occurs at electrostatically defined interfaces separating regions of different pseudospin polarization, and is associated with the helical winding of the pseudospin vector across the interface, which breaks the reflection symmetry in each valley. Electrons are transmitted with a preferred direction of up to 60 degree over a large energetic range in one of the valleys, and down to -60 degree in the other. In a Y-junction geometry, this can be used to create and detect valley polarization.
6 pages
References in corpus (11)
- Electric Field Effect in Atomically Thin Carbon Films
- The electronic properties of graphene
- Chiral tunneling and the Klein paradox in graphene
- Unconventional quantum Hall effect and Berry's phase of 2pi in bilayer graphene
- Valley filter and valley valve in graphene
- Quantum interference and Klein tunneling in graphene heterojunctions
- Veselago Lens for Electrons: Focusing and Caustics in Graphene p-n Junctions
- Quantum-limited shot noise in graphene
- Selective transmission of Dirac electrons and ballistic magnetoresistance of \textit{n-p} junctions in graphene
- Topological confinement in bilayer graphene
- Pseudospin valve in bilayer graphene: towards graphene-based pseudospintronics