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arXiv · 1805.04702

Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions

Hiroshi Kamata·Russell S. Deacon·Sadashige Matsuo·Kan Li·Sören Jeppesen·Lars Samuelson·Hongqi Xu·Koji Ishibashi·Seigo Tarucha
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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 $f_{J}$ 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 $\sim 300$ 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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Hiroshi Kamata, Russell S. Deacon, Sadashige Matsuo, Kan Li, Sören Jeppesen, Lars Samuelson, Hongqi Xu, Koji Ishibashi, Seigo Tarucha. 2018-05-12. Anomalous modulation of Josephson radiation in nanowire-based Josephson junctions. https://doi.org/10.1103/physrevb.98.041302

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