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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.5: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

An electron lens out of strained graphene — Lukas Gerhard¹, Eric Moyen², •Timofey Balashov¹, Igor Ozerov², Marc Portail³, Houda Sahaf², Laurence Masson², Wulf Wulfhekel¹, and Margrit Hanbücken² — ¹Physikalisches Institut, Karlsruhe Institute of Technology, Germany — ²CINaM-CNRS, Aix-Marseille University, Marseille, France — ³CRHEA-CNRS, Valbonne, France

An epitaxial layer of graphene was grown on a 6H-SiC(0001) crystal, prepatterned with hexagonal nano-holes. The graphene layer covers the surface smoothly, without dislocations or grain boundaries. The necessary elastic deformation of graphene leads to a strain-induced modification of electron group velocity in the graphene layer, and to an increased time-of-flight across the nano-hole. We propose to use this effect to focus two-dimensional electrons in analogy with simple optical lenses.