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Critical current fluctuations in graphene Josephson junctions

We have studied 1/f noise in critical current [Formula: see text] in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts to [Formula: see text] nA. The low frequency noise in...

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Autores principales: Haque, Mohammad T., Will, Marco, Tomi, Matti, Pandey, Preeti, Kumar, Manohar, Schmidt, Felix, Watanabe, Kenji, Taniguchi, Takashi, Danneau, Romain, Steele, Gary, Hakonen, Pertti
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8494814/
https://www.ncbi.nlm.nih.gov/pubmed/34615964
http://dx.doi.org/10.1038/s41598-021-99398-3
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author Haque, Mohammad T.
Will, Marco
Tomi, Matti
Pandey, Preeti
Kumar, Manohar
Schmidt, Felix
Watanabe, Kenji
Taniguchi, Takashi
Danneau, Romain
Steele, Gary
Hakonen, Pertti
author_facet Haque, Mohammad T.
Will, Marco
Tomi, Matti
Pandey, Preeti
Kumar, Manohar
Schmidt, Felix
Watanabe, Kenji
Taniguchi, Takashi
Danneau, Romain
Steele, Gary
Hakonen, Pertti
author_sort Haque, Mohammad T.
collection PubMed
description We have studied 1/f noise in critical current [Formula: see text] in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts to [Formula: see text] nA. The low frequency noise in the superconducting state is measured by tracking the variation in magnitude and phase of a reflection carrier signal [Formula: see text] at 600–650 MHz. We find 1/f critical current fluctuations on the order of [Formula: see text] per unit band at 1 Hz. The noise power spectrum of critical current fluctuations [Formula: see text] measured near the Dirac point at large, sub-critical rf-carrier amplitudes obeys the law [Formula: see text] where [Formula: see text] and [Formula: see text] at [Formula: see text]  Hz. Our results point towards significant fluctuations in [Formula: see text] originating from variation of the proximity induced gap in the graphene junction.
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spelling pubmed-84948142021-10-08 Critical current fluctuations in graphene Josephson junctions Haque, Mohammad T. Will, Marco Tomi, Matti Pandey, Preeti Kumar, Manohar Schmidt, Felix Watanabe, Kenji Taniguchi, Takashi Danneau, Romain Steele, Gary Hakonen, Pertti Sci Rep Article We have studied 1/f noise in critical current [Formula: see text] in h-BN encapsulated monolayer graphene contacted by NbTiN electrodes. The sample is close to diffusive limit and the switching supercurrent with hysteresis at Dirac point amounts to [Formula: see text] nA. The low frequency noise in the superconducting state is measured by tracking the variation in magnitude and phase of a reflection carrier signal [Formula: see text] at 600–650 MHz. We find 1/f critical current fluctuations on the order of [Formula: see text] per unit band at 1 Hz. The noise power spectrum of critical current fluctuations [Formula: see text] measured near the Dirac point at large, sub-critical rf-carrier amplitudes obeys the law [Formula: see text] where [Formula: see text] and [Formula: see text] at [Formula: see text]  Hz. Our results point towards significant fluctuations in [Formula: see text] originating from variation of the proximity induced gap in the graphene junction. Nature Publishing Group UK 2021-10-06 /pmc/articles/PMC8494814/ /pubmed/34615964 http://dx.doi.org/10.1038/s41598-021-99398-3 Text en © The Author(s) 2021 https://creativecommons.org/licenses/by/4.0/Open AccessThis 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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Haque, Mohammad T.
Will, Marco
Tomi, Matti
Pandey, Preeti
Kumar, Manohar
Schmidt, Felix
Watanabe, Kenji
Taniguchi, Takashi
Danneau, Romain
Steele, Gary
Hakonen, Pertti
Critical current fluctuations in graphene Josephson junctions
title Critical current fluctuations in graphene Josephson junctions
title_full Critical current fluctuations in graphene Josephson junctions
title_fullStr Critical current fluctuations in graphene Josephson junctions
title_full_unstemmed Critical current fluctuations in graphene Josephson junctions
title_short Critical current fluctuations in graphene Josephson junctions
title_sort critical current fluctuations in graphene josephson junctions
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8494814/
https://www.ncbi.nlm.nih.gov/pubmed/34615964
http://dx.doi.org/10.1038/s41598-021-99398-3
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