Evidence for Supercurrent Quantization in Interfacial Josephson Junctions
M.J. Black, B.W. Alphenaar, H. Ahmed
TL;DR
This paper reports the observation of quantized supercurrent steps in Nb/Si Josephson junctions, indicating supercurrent quantization phenomena influenced by temperature and magnetic field.
Contribution
It provides experimental evidence for supercurrent quantization in interfacial Josephson junctions, a novel insight into superconductor/semiconductor interface physics.
Findings
Discontinuities in current-voltage characteristics observed
Supercurrent steps decrease in quantized manner with temperature and magnetic field
Supercurrent quantization linked to granular Josephson junctions near the interface
Abstract
We observe a series of discontinuities in the above gap current/voltage characteristics of highly transmissive Nb/Si superconductor/semiconductor interfaces. The bias at which each switch occurs decreases in quantized steps as a function of temperature and magnetic field. The observed step-size is the same for both dependencies. We propose that the steps correspond to supercurrent quantization through granular Josephson junctions formed near the interface.
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