Helical scattering and valleytronics in bilayer graphene

Schomerus, Henning (2010) Helical scattering and valleytronics in bilayer graphene. Physical review B, 82 (16): 165409. ISSN 1550-235X

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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.

Item Type:
Journal Article
Journal or Publication Title:
Physical review B
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© 2010 The American Physical Society
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Deposited On:
30 Nov 2011 09:50
Last Modified:
31 Dec 2023 00:23