Electron flow in circular n-p junctions of bilayer graphene

Cs Péterfalvi, A. Pályi, J. Cserti

Research output: Article

10 Citations (Scopus)

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 - 2009

Fingerprint

Caustics
Graphite
Wave functions
p-n junctions
Graphene
Monolayers
graphene
Geometrical optics
Electrons
alkalies
Ballistics
wave functions
Refractive index
electrons
geometrical optics
ballistics
refractivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Electron flow in circular n-p junctions of bilayer graphene. / Péterfalvi, Cs; Pályi, A.; Cserti, J.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 7, 075416, 2009.

Research output: Article

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