Equal-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor

Abstract The recent development of superconducting spintronics has revealed the spin-triplet superconducting proximity effect from a spin-singlet superconductor into a spin-polarized normal metal. In addition recently superconducting junctions using semiconductors are in demand for highly controlled...

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Autores principales: Sadashige Matsuo, Kento Ueda, Shoji Baba, Hiroshi Kamata, Mizuki Tateno, Javad Shabani, Christopher J. Palmstrøm, Seigo Tarucha
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Publicado: Nature Portfolio 2018
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Acceso en línea:https://doaj.org/article/05aabf50e09f47df9b7a281f77fc1a9b
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spelling oai:doaj.org-article:05aabf50e09f47df9b7a281f77fc1a9b2021-12-02T11:41:13ZEqual-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor10.1038/s41598-018-21707-02045-2322https://doaj.org/article/05aabf50e09f47df9b7a281f77fc1a9b2018-02-01T00:00:00Zhttps://doi.org/10.1038/s41598-018-21707-0https://doaj.org/toc/2045-2322Abstract The recent development of superconducting spintronics has revealed the spin-triplet superconducting proximity effect from a spin-singlet superconductor into a spin-polarized normal metal. In addition recently superconducting junctions using semiconductors are in demand for highly controlled experiments to engineer topological superconductivity. Here we report experimental observation of Andreev reflection in junctions of spin-resolved quantum Hall (QH) states in an InAs quantum well and the spin-singlet superconductor NbTi. The measured conductance indicates a sub-gap feature and two peaks on the outer side of the sub-gap feature in the QH plateau-transition regime increases. The observed structures can be explained by considering transport with Andreev reflection from two channels, one originating from equal-spin Andreev reflection intermediated by spin-flip processes and second arising from normal Andreev reflection. This result indicates the possibility to induce the superconducting proximity gap in the the QH bulk state, and the possibility for the development of superconducting spintronics in semiconductor devices.Sadashige MatsuoKento UedaShoji BabaHiroshi KamataMizuki TatenoJavad ShabaniChristopher J. PalmstrømSeigo TaruchaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 8, Iss 1, Pp 1-8 (2018)
institution DOAJ
collection DOAJ
language EN
topic Medicine
R
Science
Q
spellingShingle Medicine
R
Science
Q
Sadashige Matsuo
Kento Ueda
Shoji Baba
Hiroshi Kamata
Mizuki Tateno
Javad Shabani
Christopher J. Palmstrøm
Seigo Tarucha
Equal-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor
description Abstract The recent development of superconducting spintronics has revealed the spin-triplet superconducting proximity effect from a spin-singlet superconductor into a spin-polarized normal metal. In addition recently superconducting junctions using semiconductors are in demand for highly controlled experiments to engineer topological superconductivity. Here we report experimental observation of Andreev reflection in junctions of spin-resolved quantum Hall (QH) states in an InAs quantum well and the spin-singlet superconductor NbTi. The measured conductance indicates a sub-gap feature and two peaks on the outer side of the sub-gap feature in the QH plateau-transition regime increases. The observed structures can be explained by considering transport with Andreev reflection from two channels, one originating from equal-spin Andreev reflection intermediated by spin-flip processes and second arising from normal Andreev reflection. This result indicates the possibility to induce the superconducting proximity gap in the the QH bulk state, and the possibility for the development of superconducting spintronics in semiconductor devices.
format article
author Sadashige Matsuo
Kento Ueda
Shoji Baba
Hiroshi Kamata
Mizuki Tateno
Javad Shabani
Christopher J. Palmstrøm
Seigo Tarucha
author_facet Sadashige Matsuo
Kento Ueda
Shoji Baba
Hiroshi Kamata
Mizuki Tateno
Javad Shabani
Christopher J. Palmstrøm
Seigo Tarucha
author_sort Sadashige Matsuo
title Equal-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor
title_short Equal-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor
title_full Equal-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor
title_fullStr Equal-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor
title_full_unstemmed Equal-Spin Andreev Reflection on Junctions of Spin-Resolved Quantum Hall Bulk State and Spin-Singlet Superconductor
title_sort equal-spin andreev reflection on junctions of spin-resolved quantum hall bulk state and spin-singlet superconductor
publisher Nature Portfolio
publishDate 2018
url https://doaj.org/article/05aabf50e09f47df9b7a281f77fc1a9b
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