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Helical scattering and valleytronics in bilayer graphene

Research output: Contribution to journalJournal articlepeer-review

Article number165409
<mark>Journal publication date</mark>6/10/2010
<mark>Journal</mark>Physical review B
Issue number16
Number of pages0
Publication StatusPublished
<mark>Original language</mark>English


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° over a large energetic range in one of the valleys, and down to −60° in the other. In a Y-junction geometry, this can be used to create and detect valley polarization.

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© 2010 The American Physical Society