Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures

Topological superconductors are an interesting and frontier topic in condensed matter physics. In the superconducting state, an order parameter will be established with the basic or subsidiary symmetry of the crystalline lattice. In doped Bi(2)Se(3) or Bi(2)Te(3) with a basic threefold symmetry, it...

Descripción completa

Detalles Bibliográficos
Autores principales: Chen, Mingyang, Chen, Xiaoyu, Yang, Huan, Du, Zengyi, Wen, Hai-Hu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5993472/
https://www.ncbi.nlm.nih.gov/pubmed/29888330
http://dx.doi.org/10.1126/sciadv.aat1084
_version_ 1783330240635863040
author Chen, Mingyang
Chen, Xiaoyu
Yang, Huan
Du, Zengyi
Wen, Hai-Hu
author_facet Chen, Mingyang
Chen, Xiaoyu
Yang, Huan
Du, Zengyi
Wen, Hai-Hu
author_sort Chen, Mingyang
collection PubMed
description Topological superconductors are an interesting and frontier topic in condensed matter physics. In the superconducting state, an order parameter will be established with the basic or subsidiary symmetry of the crystalline lattice. In doped Bi(2)Se(3) or Bi(2)Te(3) with a basic threefold symmetry, it was predicted, however, that bulk superconductivity with order parameters of twofold symmetry may exist because of the presence of odd parity. We report the proximity effect–induced superconductivity in the Bi(2)Te(3) thin film on top of the iron-based superconductor FeTe(0.55)Se(0.45). By using the quasiparticle interference technique, we demonstrate clear evidence of twofold symmetry of the superconducting gap. The gap minimum is along one of the main crystalline axes following the so-called Δ(4y) notation. This is also accompanied by the elongated vortex shape mapped out by the density of states within the superconducting gap. Our results provide an easily accessible platform for investigating possible topological superconductivity in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures.
format Online
Article
Text
id pubmed-5993472
institution National Center for Biotechnology Information
language English
publishDate 2018
publisher American Association for the Advancement of Science
record_format MEDLINE/PubMed
spelling pubmed-59934722018-06-10 Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures Chen, Mingyang Chen, Xiaoyu Yang, Huan Du, Zengyi Wen, Hai-Hu Sci Adv Research Articles Topological superconductors are an interesting and frontier topic in condensed matter physics. In the superconducting state, an order parameter will be established with the basic or subsidiary symmetry of the crystalline lattice. In doped Bi(2)Se(3) or Bi(2)Te(3) with a basic threefold symmetry, it was predicted, however, that bulk superconductivity with order parameters of twofold symmetry may exist because of the presence of odd parity. We report the proximity effect–induced superconductivity in the Bi(2)Te(3) thin film on top of the iron-based superconductor FeTe(0.55)Se(0.45). By using the quasiparticle interference technique, we demonstrate clear evidence of twofold symmetry of the superconducting gap. The gap minimum is along one of the main crystalline axes following the so-called Δ(4y) notation. This is also accompanied by the elongated vortex shape mapped out by the density of states within the superconducting gap. Our results provide an easily accessible platform for investigating possible topological superconductivity in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures. American Association for the Advancement of Science 2018-06-08 /pmc/articles/PMC5993472/ /pubmed/29888330 http://dx.doi.org/10.1126/sciadv.aat1084 Text en Copyright © 2018 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Research Articles
Chen, Mingyang
Chen, Xiaoyu
Yang, Huan
Du, Zengyi
Wen, Hai-Hu
Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures
title Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures
title_full Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures
title_fullStr Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures
title_full_unstemmed Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures
title_short Superconductivity with twofold symmetry in Bi(2)Te(3)/FeTe(0.55)Se(0.45) heterostructures
title_sort superconductivity with twofold symmetry in bi(2)te(3)/fete(0.55)se(0.45) heterostructures
topic Research Articles
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5993472/
https://www.ncbi.nlm.nih.gov/pubmed/29888330
http://dx.doi.org/10.1126/sciadv.aat1084
work_keys_str_mv AT chenmingyang superconductivitywithtwofoldsymmetryinbi2te3fete055se045heterostructures
AT chenxiaoyu superconductivitywithtwofoldsymmetryinbi2te3fete055se045heterostructures
AT yanghuan superconductivitywithtwofoldsymmetryinbi2te3fete055se045heterostructures
AT duzengyi superconductivitywithtwofoldsymmetryinbi2te3fete055se045heterostructures
AT wenhaihu superconductivitywithtwofoldsymmetryinbi2te3fete055se045heterostructures