Quasiparticle Trapping at Vortices Producing Josephson Supercurrent Enhancement
(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
- Sato, Yosuke ; Ueda, Kento ; Takeshige, Yuusuke ; Kamata, Hiroshi ; Li, Kan ; Samuelson, Lars LU ; Xu, H. Q. LU ; Matsuo, Sadashige and Tarucha, Seigo
- organization
- publishing date
- 2022-05
- 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
- 2024-09-19 23:37:33
@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}}, }