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24 October 2021
 
  » arxiv » 1706.0762

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Conductance oscillations 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 ;
Date 2 Jun 2017
AbstractWe 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 interpret the oscillations in transparent junctions as proximity-induced geometrical effects in transport to bulk $Bi_2Te_3$ carriers, while transport to the topological surface state dominates at high scattering at the interface.
Source arXiv, 1706.0762
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