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Quasiparticle Trapping at Vortices Producing Josephson Supercurrent Enhancement

Sato, Yosuke ; Ueda, Kento ; Takeshige, Yuusuke ; Kamata, Hiroshi ; Li, Kan ; Samuelson, Lars LU ; Xu, H. Q. LU ; Matsuo, Sadashige and Tarucha, Seigo (2022) In Physical Review Letters 128(20).
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... (More)

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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author
; ; ; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
128
issue
20
article number
207001
publisher
American Physical Society
external identifiers
  • scopus:85131595198
  • pmid:35657870
ISSN
0031-9007
DOI
10.1103/PhysRevLett.128.207001
language
English
LU publication?
yes
id
97daed81-d8c6-4306-a37d-445e3e1d6aa9
date added to LUP
2023-01-02 14:16:48
date last changed
2024-06-13 14:26:08
@article{97daed81-d8c6-4306-a37d-445e3e1d6aa9,
  abstract     = {{<p>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.</p>}},
  author       = {{Sato, Yosuke and Ueda, Kento and Takeshige, Yuusuke and Kamata, Hiroshi and Li, Kan and Samuelson, Lars and Xu, H. Q. and Matsuo, Sadashige and Tarucha, Seigo}},
  issn         = {{0031-9007}},
  language     = {{eng}},
  number       = {{20}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review Letters}},
  title        = {{Quasiparticle Trapping at Vortices Producing Josephson Supercurrent Enhancement}},
  url          = {{http://dx.doi.org/10.1103/PhysRevLett.128.207001}},
  doi          = {{10.1103/PhysRevLett.128.207001}},
  volume       = {{128}},
  year         = {{2022}},
}