Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2010-07-26
Phys. Rev. B 82, 165409 (2010)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
6 pages
Scientific paper
10.1103/PhysRevB.82.165409
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.
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