Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions

Details Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions

2008-08-04

arxiv.org/abs/0808.0488v2

Phys. Rev. Lett. 101, 156804 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pgs, 4 fgs

Scientific paper

10.1103/PhysRevLett.101.156804

We present a theory of quantum-coherent transport through a lateral p-n-p structure in graphene, which fully accounts for the interference of forward and backward scattering on the p-n interfaces. The backreflection amplitude changes sign at zero incidence angle because of the Klein phenomenon, adding a phase $\pi$ to the interference fringes. The contributions of the two p-n interfaces to the phase of the interference cancel with each other at zero magnetic field, but become imbalanced at a finite field. The resulting half a period shift in the Fabry-Perot fringe pattern, induced by a relatively weak magnetic field, can provide a clear signature of Klein scattering in graphene. This effect is shown to be robust in the presence of spatially inhomogeneous potential of moderate strength.

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