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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 | | 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 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 | | Services: | Forum | Review | PDF | Favorites | |
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