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Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator
The narrow quantum spin Hall (QSH) insulator is characterized by interedge coupling, which could feature exotic transport phenomena, and thus serves as the key element for topological superconducting electronic devices. Herein, we theoretically explore possible Josephson π states in a QSH insulator...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5587695/ https://www.ncbi.nlm.nih.gov/pubmed/28878292 http://dx.doi.org/10.1038/s41598-017-10960-4 |
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author | Yu, Qingyun Tao, Ze Song, Juntao Tao, Y. C. Wang, Jun |
author_facet | Yu, Qingyun Tao, Ze Song, Juntao Tao, Y. C. Wang, Jun |
author_sort | Yu, Qingyun |
collection | PubMed |
description | The narrow quantum spin Hall (QSH) insulator is characterized by interedge coupling, which could feature exotic transport phenomena, and thus serves as the key element for topological superconducting electronic devices. Herein, we theoretically explore possible Josephson π states in a QSH insulator strip touching on two s-wave superconductors in the presence of the interedge coupling. It is shown that the interedge coupling could give rise to a 0 − π transition modulated by the gate voltage, originating from an additional π phase difference caused by the interedge backscattering. The 0 − π transition in turn can manifest the helical spin texture of the edge states. A considerable residual value of the supercurrent at the 0 − π transition point is always exhibited, suggesting a very efficient performance of the device as a supercurrent switch. Moreover, the region of coexisting 0 and π states is found fairly large, which can be used to improve accuracy in the design of a π superconducting quantum interference device. |
format | Online Article Text |
id | pubmed-5587695 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-55876952017-09-13 Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator Yu, Qingyun Tao, Ze Song, Juntao Tao, Y. C. Wang, Jun Sci Rep Article The narrow quantum spin Hall (QSH) insulator is characterized by interedge coupling, which could feature exotic transport phenomena, and thus serves as the key element for topological superconducting electronic devices. Herein, we theoretically explore possible Josephson π states in a QSH insulator strip touching on two s-wave superconductors in the presence of the interedge coupling. It is shown that the interedge coupling could give rise to a 0 − π transition modulated by the gate voltage, originating from an additional π phase difference caused by the interedge backscattering. The 0 − π transition in turn can manifest the helical spin texture of the edge states. A considerable residual value of the supercurrent at the 0 − π transition point is always exhibited, suggesting a very efficient performance of the device as a supercurrent switch. Moreover, the region of coexisting 0 and π states is found fairly large, which can be used to improve accuracy in the design of a π superconducting quantum interference device. Nature Publishing Group UK 2017-09-06 /pmc/articles/PMC5587695/ /pubmed/28878292 http://dx.doi.org/10.1038/s41598-017-10960-4 Text en © The Author(s) 2017 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Yu, Qingyun Tao, Ze Song, Juntao Tao, Y. C. Wang, Jun Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator |
title | Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator |
title_full | Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator |
title_fullStr | Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator |
title_full_unstemmed | Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator |
title_short | Supercurrent switch in π topological junctions based upon a narrow quantum spin Hall insulator |
title_sort | supercurrent switch in π topological junctions based upon a narrow quantum spin hall insulator |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5587695/ https://www.ncbi.nlm.nih.gov/pubmed/28878292 http://dx.doi.org/10.1038/s41598-017-10960-4 |
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