Journal Articles Applied Physics Letters Year : 2012

A graphene electron lens

Abstract

An epitaxial layer of graphene was grown on a pre patterned 6H-SiC(0001) crystal. The graphene smoothly covers the hexagonal nano-holes in the substrate without the introduction of small angle grain boundaries or dislocations. This is achieved by an elastic deformation of the graphene by ~0.3% in accordance to its large elastic strain limit. This elastic stretching of the graphene leads to a modification of the band structure and to a local lowering of the electron group velocity of the graphene. We propose to use this effect to focus two-dimensional electrons in analogy to simple optical lenses.
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Dates and versions

hal-00697534 , version 1 (18-10-2017)

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L. Gerhard, E. Moyen, T. Balashov, I. Ozerov, M. Portail, et al.. A graphene electron lens. Applied Physics Letters, 2012, 100 (19), pp.153106. ⟨10.1063/1.3701594⟩. ⟨hal-00697534⟩
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