Volume 119, Number 5, September 2017
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||22 November 2017|
Conductance oscillations and zero-bias anomaly in a single superconducting junction to a three-dimensional Bi2Te3 topological insulator
1 Institute of Solid State Physics RAS - Chernogolovka, Moscow District, 142432, Russia
2 A.V. Rzanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences 630090 Novosibirsk, Russia
3 Saint-Petersburg State University - 198504 Saint-Petersburg, Russia
4 Novosibirsk State University - 630090 Novosibirsk, Russia
5 V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences 630090 Novosibirsk, Russia
Received: 13 September 2017
Accepted: 18 October 2017
We experimentally investigate Andreev transport through a single junction between an s-wave indium superconductor and a thick film of a three-dimensional Bi2Te3 topological insulator. We study Bi2Te3 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-Bi2Te3 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 Bi2Te3 topological surface state.
PACS: 74.45.+c – Proximity effects; Andreev reflection; SN and SNS junctions / 73.23.-b – Electronic transport in mesoscopic systems / 73.40.-c – Electronic transport in interface structures
© EPLA, 2017
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