Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 35: Graphene: Transport (TT, jointly with HL, MA, O)

HL 35.11: Talk

Tuesday, March 12, 2013, 12:15–12:30, H17

Mie scattering analogon in graphene: particle confinement, scattering resonances, and Fano effect — •Rafael Leslie Heinisch, Christian Schulz, Franz Xaver Bronold, and Holger Fehske — Institut für Physik, Universität Greifswald

We study the scattering of an incident electron by a circular step in a graphene monolayer in analogy to Mie scattering of light by a sphere. Klein tunnelling results in the absence of backscattering and often entails enhanced forward scattering. For low electron energies we identify sharp resonances originating from quasi-bound states at the dot. The energy and dot radius dependent temporary electron trapping significantly increases the electron density in the dot and induces a vortex pattern in the current field. The angle-resolved scattering exhibits Fano resonances which - counter-intuitive for Klein tunnelling - dramatically suppress forward scattering.

This work is supported by the DFG through SPP 1459.