Single channel Josephson effect in a high transmission atomic contact

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Autoren

  • Jacob Senkpiel
  • Simon Dambach
  • Markus Etzkorn
  • Robert Drost
  • Ciprian Padurariu
  • Björn Kubala
  • Wolfgang Belzig
  • Alfredo Levy Yeyati
  • Juan Carlos Cuevas
  • Joachim Ankerhold
  • Christian R. Ast
  • Klaus Kern

Externe Organisationen

  • Max-Planck-Institut für Festkörperforschung
  • Universität Ulm
  • Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR)
  • Universität Konstanz
  • Universidad Autónoma de Madrid (UAM)
  • Eidgenössische Technische Hochschule Lausanne (ETHL)
Forschungs-netzwerk anzeigen

Details

OriginalspracheEnglisch
Aufsatznummer131
FachzeitschriftCommunications Physics
Jahrgang3
Ausgabenummer1
PublikationsstatusVeröffentlicht - 1 Dez. 2020
Extern publiziertJa

Abstract

The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of a superconductor on a local scale. We use atomic manipulation in a low temperature STM to create mesoscopic single channel contacts and study the Josephson effect at arbitrary transmissions. We observe significant deviations from the Ambegaokar-Baratoff formula relating the critical current to the order parameter starting from transmissions of τ > 0.1. Using the full current-phase relation, we model the Josephson effect in the dynamical Coulomb blockade regime, where the charging energy of the junction capacitance cannot be neglected, and find excellent agreement with the experimental data. Projecting the current-phase relation onto the charge transfer operator shows that at high transmission, non-linear behaviour arises and multiple Cooper pair tunneling may occur. Our model includes these deviations, which become non-negligible in Josephson-STM, for example, when scanning across single adatoms.

ASJC Scopus Sachgebiete

Zitieren

Single channel Josephson effect in a high transmission atomic contact. / Senkpiel, Jacob; Dambach, Simon; Etzkorn, Markus et al.
in: Communications Physics, Jahrgang 3, Nr. 1, 131, 01.12.2020.

Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review

Senkpiel, J, Dambach, S, Etzkorn, M, Drost, R, Padurariu, C, Kubala, B, Belzig, W, Yeyati, AL, Cuevas, JC, Ankerhold, J, Ast, CR & Kern, K 2020, 'Single channel Josephson effect in a high transmission atomic contact', Communications Physics, Jg. 3, Nr. 1, 131. https://doi.org/10.1038/s42005-020-00397-z
Senkpiel, J., Dambach, S., Etzkorn, M., Drost, R., Padurariu, C., Kubala, B., Belzig, W., Yeyati, A. L., Cuevas, J. C., Ankerhold, J., Ast, C. R., & Kern, K. (2020). Single channel Josephson effect in a high transmission atomic contact. Communications Physics, 3(1), Artikel 131. https://doi.org/10.1038/s42005-020-00397-z
Senkpiel J, Dambach S, Etzkorn M, Drost R, Padurariu C, Kubala B et al. Single channel Josephson effect in a high transmission atomic contact. Communications Physics. 2020 Dez 1;3(1):131. doi: 10.1038/s42005-020-00397-z
Senkpiel, Jacob ; Dambach, Simon ; Etzkorn, Markus et al. / Single channel Josephson effect in a high transmission atomic contact. in: Communications Physics. 2020 ; Jahrgang 3, Nr. 1.
Download
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abstract = "The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of a superconductor on a local scale. We use atomic manipulation in a low temperature STM to create mesoscopic single channel contacts and study the Josephson effect at arbitrary transmissions. We observe significant deviations from the Ambegaokar-Baratoff formula relating the critical current to the order parameter starting from transmissions of τ > 0.1. Using the full current-phase relation, we model the Josephson effect in the dynamical Coulomb blockade regime, where the charging energy of the junction capacitance cannot be neglected, and find excellent agreement with the experimental data. Projecting the current-phase relation onto the charge transfer operator shows that at high transmission, non-linear behaviour arises and multiple Cooper pair tunneling may occur. Our model includes these deviations, which become non-negligible in Josephson-STM, for example, when scanning across single adatoms.",
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AU - Senkpiel, Jacob

AU - Dambach, Simon

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AU - Drost, Robert

AU - Padurariu, Ciprian

AU - Kubala, Björn

AU - Belzig, Wolfgang

AU - Yeyati, Alfredo Levy

AU - Cuevas, Juan Carlos

AU - Ankerhold, Joachim

AU - Ast, Christian R.

AU - Kern, Klaus

N1 - Funding information: We gratefully acknowledge fruitful discussions with Berthold Jäck and Elke Scheer. Funding from the European Research Council for the Consolidator Grant ABSOLUTE-SPIN (Grant No. 681164), from the Spanish MINECO (Grant No. FIS2014-55486-P, FIS2017-84057-P and FIS2017-84860-R), from the “María de Maeztu” Programme for Units of Excellence in R&D (MDM-2014-0377), from the Zeiss Foundation, from the DFG through AN336/11-1 and from the IQST is also gratefully acknowledged. J.C.C. and W.B. acknowledge support from the DFG through SFB 767.

PY - 2020/12/1

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N2 - The Josephson effect in scanning tunneling microscopy (STM) is an excellent tool to probe the properties of a superconductor on a local scale. We use atomic manipulation in a low temperature STM to create mesoscopic single channel contacts and study the Josephson effect at arbitrary transmissions. We observe significant deviations from the Ambegaokar-Baratoff formula relating the critical current to the order parameter starting from transmissions of τ > 0.1. Using the full current-phase relation, we model the Josephson effect in the dynamical Coulomb blockade regime, where the charging energy of the junction capacitance cannot be neglected, and find excellent agreement with the experimental data. Projecting the current-phase relation onto the charge transfer operator shows that at high transmission, non-linear behaviour arises and multiple Cooper pair tunneling may occur. Our model includes these deviations, which become non-negligible in Josephson-STM, for example, when scanning across single adatoms.

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