TY - JOUR

T1 - Helical scattering and valleytronics in bilayer graphene

AU - Schomerus, Henning

N1 - © 2010 The American Physical Society

PY - 2010/10/6

Y1 - 2010/10/6

N2 - 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.

AB - 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.

U2 - 10.1103/PhysRevB.82.165409

DO - 10.1103/PhysRevB.82.165409

M3 - Journal article

VL - 82

JO - Physical review B

JF - Physical review B

SN - 1550-235X

IS - 16

M1 - 165409

ER -