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Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions

H. Kamata, R. S. Deacon, S. Matsuo, K. Li, S. Jeppesen, L. Samuelson, H. Q. Xu, K. Ishibashi, and S. Tarucha
Phys. Rev. B 98, 041302(R) – Published 19 July 2018
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Abstract

We investigate the Josephson radiation of nanowire (NW)-based Josephson junctions in a parallel magnetic field. The Josephson junction made of an InAs NW with superconducting Al leads shows the emission spectra which follow the Josephson frequency over the range 4–8 GHz at zero magnetic field. We observe an apparent deviation of the emission spectra from the Josephson frequency which is accompanied by a strong enhancement of the switching current above a magnetic field of 300 mT. The observed modulations can be understood to reflect trivial changes in the superconducting circuit surrounding the device which is strongly affected by the applied magnetic field. Our findings will provide a way to accurately investigate topological properties in NW-based systems.

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  • Received 2 May 2018

DOI:https://doi.org/10.1103/PhysRevB.98.041302

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

H. Kamata1,2,*, R. S. Deacon1,3, S. Matsuo2, K. Li4, S. Jeppesen5, L. Samuelson5, H. Q. Xu4,5, K. Ishibashi1,3, and S. Tarucha1,2,†

  • 1Center for Emergent Matter Science, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 2Department of Applied Physics, University of Tokyo, 7-3-1 Hongo, Bunkyo, Tokyo 113-8656, Japan
  • 3Advanced Device Laboratory, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
  • 4Beijing Key Laboratory of Quantum Devices, Key Laboratory for the Physics and Chemistry of Nanodevices, and Department of Electronics, Peking University, Beijing 100871, China
  • 5Division of Solid State Physics, Lund University, Box 118, SE-221 00 Lund, Sweden

  • *hiroshi.kamata@riken.jp
  • tarucha@ap.t.u-tokyo.ac.jp

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Issue

Vol. 98, Iss. 4 — 15 July 2018

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