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arXiv · 0808.0488

Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions

A. V. Shytov·M. S. Rudner·L. S. Levitov
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Abstract

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 $π$ 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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A. V. Shytov, M. S. Rudner, L. S. Levitov. 2008-08-27. Klein Backscattering and Fabry-Perot Interference in Graphene Heterojunctions. https://doi.org/10.1103/physrevlett.101.156804

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