Electron flow in circular n-p junctions of bilayer graphene

Cs Péterfalvi, A. Pályi, J. Cserti

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Abstract

We present a theoretical study of electron wave functions in ballistic circular n-p junctions of bilayer graphene. Similarly to the case of a circular n-p junction of monolayer graphene, we find that (i) the wave functions form caustics inside the circular region and (ii) the shape of these caustics are well described by a geometrical optics model using the concept of a negative refractive index. In contrast to the monolayer case, we show that the strong focusing effect is absent in the bilayer. We explain these findings in terms of the angular dependence of Klein tunneling at a planar n-p junction.

Original languageEnglish
Article number075416
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number7
DOIs
Publication statusPublished - szept. 21 2009

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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