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Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures

Over the last decade, the possibility of realizing topological superconductivity (TSC) has generated much excitement. TSC can be created in electronic systems where the topological and superconducting orders coexist, motivating the continued exploration of candidate material platforms to this end. H...

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Autores principales: Yi, Hemian, Hu, Lun-Hui, Zhao, Yi-Fan, Zhou, Ling-Jie, Yan, Zi-Jie, Zhang, Ruoxi, Yuan, Wei, Wang, Zihao, Wang, Ke, Hickey, Danielle Reifsnyder, Richardella, Anthony R., Singleton, John, Winter, Laurel E., Wu, Xianxin, Chan, Moses H. W., Samarth, Nitin, Liu, Chao-Xing, Chang, Cui-Zu
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10628154/
https://www.ncbi.nlm.nih.gov/pubmed/37932274
http://dx.doi.org/10.1038/s41467-023-42902-2
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author Yi, Hemian
Hu, Lun-Hui
Zhao, Yi-Fan
Zhou, Ling-Jie
Yan, Zi-Jie
Zhang, Ruoxi
Yuan, Wei
Wang, Zihao
Wang, Ke
Hickey, Danielle Reifsnyder
Richardella, Anthony R.
Singleton, John
Winter, Laurel E.
Wu, Xianxin
Chan, Moses H. W.
Samarth, Nitin
Liu, Chao-Xing
Chang, Cui-Zu
author_facet Yi, Hemian
Hu, Lun-Hui
Zhao, Yi-Fan
Zhou, Ling-Jie
Yan, Zi-Jie
Zhang, Ruoxi
Yuan, Wei
Wang, Zihao
Wang, Ke
Hickey, Danielle Reifsnyder
Richardella, Anthony R.
Singleton, John
Winter, Laurel E.
Wu, Xianxin
Chan, Moses H. W.
Samarth, Nitin
Liu, Chao-Xing
Chang, Cui-Zu
author_sort Yi, Hemian
collection PubMed
description Over the last decade, the possibility of realizing topological superconductivity (TSC) has generated much excitement. TSC can be created in electronic systems where the topological and superconducting orders coexist, motivating the continued exploration of candidate material platforms to this end. Here, we use molecular beam epitaxy (MBE) to synthesize heterostructures that host emergent interfacial superconductivity when a non-superconducting antiferromagnet (FeTe) is interfaced with a topological insulator (TI) (Bi, Sb)(2)Te(3). By performing in-vacuo angle-resolved photoemission spectroscopy (ARPES) and ex-situ electrical transport measurements, we find that the superconducting transition temperature and the upper critical magnetic field are suppressed when the chemical potential approaches the Dirac point. We provide evidence to show that the observed interfacial superconductivity and its chemical potential dependence is the result of the competition between the Ruderman-Kittel-Kasuya-Yosida-type ferromagnetic coupling mediated by Dirac surface states and antiferromagnetic exchange couplings that generate the bicollinear antiferromagnetic order in the FeTe layer.
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spelling pubmed-106281542023-11-08 Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures Yi, Hemian Hu, Lun-Hui Zhao, Yi-Fan Zhou, Ling-Jie Yan, Zi-Jie Zhang, Ruoxi Yuan, Wei Wang, Zihao Wang, Ke Hickey, Danielle Reifsnyder Richardella, Anthony R. Singleton, John Winter, Laurel E. Wu, Xianxin Chan, Moses H. W. Samarth, Nitin Liu, Chao-Xing Chang, Cui-Zu Nat Commun Article Over the last decade, the possibility of realizing topological superconductivity (TSC) has generated much excitement. TSC can be created in electronic systems where the topological and superconducting orders coexist, motivating the continued exploration of candidate material platforms to this end. Here, we use molecular beam epitaxy (MBE) to synthesize heterostructures that host emergent interfacial superconductivity when a non-superconducting antiferromagnet (FeTe) is interfaced with a topological insulator (TI) (Bi, Sb)(2)Te(3). By performing in-vacuo angle-resolved photoemission spectroscopy (ARPES) and ex-situ electrical transport measurements, we find that the superconducting transition temperature and the upper critical magnetic field are suppressed when the chemical potential approaches the Dirac point. We provide evidence to show that the observed interfacial superconductivity and its chemical potential dependence is the result of the competition between the Ruderman-Kittel-Kasuya-Yosida-type ferromagnetic coupling mediated by Dirac surface states and antiferromagnetic exchange couplings that generate the bicollinear antiferromagnetic order in the FeTe layer. Nature Publishing Group UK 2023-11-06 /pmc/articles/PMC10628154/ /pubmed/37932274 http://dx.doi.org/10.1038/s41467-023-42902-2 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/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/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Yi, Hemian
Hu, Lun-Hui
Zhao, Yi-Fan
Zhou, Ling-Jie
Yan, Zi-Jie
Zhang, Ruoxi
Yuan, Wei
Wang, Zihao
Wang, Ke
Hickey, Danielle Reifsnyder
Richardella, Anthony R.
Singleton, John
Winter, Laurel E.
Wu, Xianxin
Chan, Moses H. W.
Samarth, Nitin
Liu, Chao-Xing
Chang, Cui-Zu
Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
title Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
title_full Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
title_fullStr Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
title_full_unstemmed Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
title_short Dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
title_sort dirac-fermion-assisted interfacial superconductivity in epitaxial topological-insulator/iron-chalcogenide heterostructures
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10628154/
https://www.ncbi.nlm.nih.gov/pubmed/37932274
http://dx.doi.org/10.1038/s41467-023-42902-2
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