npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Article

Research Paper

New Phys.: Sae Mulli 2018; 68: 1041-1047

Published online October 31, 2018 https://doi.org/10.3938/NPSM.68.1041

Copyright © New Physics: Sae Mulli.

Quantum Electronic Transport in (Bi$_{0.84}$Sb$_{0.16}$)$_2$Se$_3$ Topological Insulator Nanowire

Heungsoon IM, Hong-Seok KIM, Nam-Hee KIM, Yong-Joo DOH*

Department of Physics and Photon Science, Gwangju Institute of Science and Technology, Gwangju 61005, Korea

Correspondence to:yjdoh@gist.ac.kr

Received: July 27, 2018; Revised: August 31, 2018; Accepted: September 6, 2018

This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A topological insulator (TI) in contact with a conventional superconductor can provide a useful platform for creating exotic quasi-particles such as Majorana fermions. Here, we report the quantum electronic transport properties of (Bi$_{0.84}$Sb$_{0.16}$)$_2$Se$_3$ TI nanowire in contact with superconducting electrodes. When a magnetic field is applied perpendicular to the substrate, a negative magneto-conductance behavior is observed as a result of a weak antilocalization (WAL) effect in the topological surface states. In the superconducting state of the Al electrodes on top of the TI nanowire, a conductance enhancement is observed due to Andreev reflection at the interface between the TI nanowire and the superconducting electrode. Our experimental results should be useful in developing TI-based superconducting junctions, which are essential ingredients for topological quantum computing technology. 

Keywords: Topological insulator, Superconductivity, Josephson junction ,

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