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arXiv · 1706.00762

Conductance oscillations and zero-bias anomaly in a single superconducting junction to a three-dimensional $Bi_2Te_3$ topological insulator

O. O. Shvetsov·V. A. Kostarev·A. Kononov·V. A. Golyashov·K. A. Kokh·O. E. Tereshchenko·E. V. Deviatov
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Abstract

We experimentally investigate Andreev transport through a single junction between an s-wave indium superconductor and a thick film of a three-dimensional $Bi_2Te_3$ topological insulator. We study $Bi_2Te_3$ samples with different bulk and surface characteristics, where the presence of a topological surface state is confirmed by direct ARPES measurements. All the junctions demonstrate Andreev transport within the superconducting gap. For junctions with transparent $In-Bi_2Te_3$ interfaces we find a number of nearly periodic conductance oscillations, which are accompanied by zero-bias conductance anomaly. Both effects disappear above the superconducting transition or for resistive junctions. We propose a consistent interpretation of both effects as originating from proximity-induced superconducting correlations within the $Bi_2Te_3$ topological surface state.

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O. O. Shvetsov, V. A. Kostarev, A. Kononov, V. A. Golyashov, K. A. Kokh, O. E. Tereshchenko, E. V. Deviatov. 2017-06-02. Conductance oscillations and zero-bias anomaly in a single superconducting junction to a three-dimensional $Bi_2Te_3$ topological insulator. https://doi.org/10.1209/0295-5075/119/57009

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