A graphene electron lens

作者：Gerhard L^*; Moyen E; Balashov T; Ozerov I; Portail M; Sahaf H; Masson L; Wulfhekel W; Hanbuecken M

来源：Applied Physics Letters, 2012, 100(15): 153106.

DOI：10.1063/1.3701594

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 approximate to 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.

• 出版日期2012-4-9