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Quasiparticle Trapping at Vortices Producing Josephson Supercurrent Enhancement

Yosuke Sato, Kento Ueda, Yuusuke Takeshige, Hiroshi Kamata, Kan Li, Lars Samuelson, H. Q. Xu, Sadashige Matsuo, and Seigo Tarucha
Phys. Rev. Lett. 128, 207001 – Published 19 May 2022
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Abstract

The Josephson junction of a strong spin-orbit material under a magnetic field is a promising Majorana fermion candidate. Supercurrent enhancement by a magnetic field has been observed in the InAs nanowire Josephson junctions and assigned to a topological transition. In this work we observe a similar phenomenon but discuss the nontopological origin by considering the trapping of quasiparticles by vortices that penetrate the superconductor under a finite magnetic field. This assignment is supported by the observed hysteresis of the switching current when sweeping up and down the magnetic field. Our experiment shows the importance of quasiparticles in superconducting devices with a magnetic field, which can provide important insights for the design of qubits using superconductors.

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  • Received 24 November 2021
  • Accepted 4 April 2022

DOI:https://doi.org/10.1103/PhysRevLett.128.207001

© 2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yosuke Sato1,2,*, Kento Ueda1,†, Yuusuke Takeshige1, Hiroshi Kamata3, Kan Li4, Lars Samuelson5,6, H. Q. Xu4,5,7,‡, Sadashige Matsuo2,8,§, and Seigo Tarucha2,9,∥

  • 1Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
  • 2Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
  • 3Laboratoire de Physique de l’École Normale Supérieure, ENS, PSL Research University, CNRS, Sorbonne Université, Université Paris Diderot, Sorbonne Paris Cité, 24 rue Lhomond, 75231 Paris Cedex 05, France
  • 4Beijing Key Laboratory of Quantum Devices, Key Laboratory for the Physics and Chemistry of Nanodevices and School of Electronics, Peking University, Beijing 100871, China
  • 5Division of Solid State Physics and NanoLund, Lund University, Box 118, SE-221 00 Lund, Sweden
  • 6Department of Electrical and Electronic Engineering, Southern University of Science and Technology, 1088 Xueyuan Blvd, Nanshan, Shenzhen, Guangdong 518055, China
  • 7Beijing Academy of Quantum Information Sciences, Beijing 100193, China
  • 8JST, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
  • 9RIKEN Center for Quantum Computing, RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan

  • *yosuke.sato@riken.jp
  • kento.ueda@riken.jp
  • hqxu@pku.edu.cn
  • §sadashige.matsuo@riken.jp
  • tarucha@riken.jp

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Issue

Vol. 128, Iss. 20 — 20 May 2022

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