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 ∼ 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.
Original language | English (US) |
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Article number | 203101 |
Journal | Applied Physics Letters |
Volume | 108 |
Issue number | 20 |
DOIs | |
State | Published - May 16 2016 |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)