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arXiv · 1503.06898

Robust Fabry-Perot interference in dual-gated Bi$_2$Se$_3$ devices

A. D. K. Finck·C. Kurter·E. D. Huemiller·Y. S. Hor·D. J. Van Harlingen
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Abstract

We study Fabry-Perot interference in hybrid devices, each consisting of a mesoscopic superconducting disk deposited on the surface of a three-dimensional topological insulator. Such structures are hypothesized to contain protected zero modes known as Majorana fermions bound to vortices. The interference manifests as periodic conductance oscillations of magnitude $\sim 0.1$ $e^2/h$. These oscillations show no strong dependence on bulk carrier density or sample thickness, suggesting that they result from phase coherent transport in surface states. However, the Fabry-Perot interference can be tuned by both top and back gates, implying strong electrostatic coupling between the top and bottom surfaces of topological insulator.

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A. D. K. Finck, C. Kurter, E. D. Huemiller, Y. S. Hor, D. J. Van Harlingen. 2016-05-03. Robust Fabry-Perot interference in dual-gated Bi$_2$Se$_3$ devices. https://doi.org/10.1063/1.4949490

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