Giant nonlinearity of kinetic inductance in superconducting hybrid strip
Abstract
We demonstrate giant nonlinearity of the kinetic inductance Lk in a superconducting NbN/Al hybrid strip. In contrast to ordinary superconductors, where the maximum observed current-induced variation of Lk does not exceed tens of percent, we observe a 50-fold change in Lk. Physically, this effect is connected with the proximity-induced superconductivity in the Al layer and the specific choice of parameters for which the dependence of the superconducting current I on the Cooper pair momentum ℏ q exhibits a plateau at a current I* {\it well below} the depairing current. Formally, this leads to Lk ∼ dq/dI → ∞ as I → I*. We believe that our results open a new route for creating the next generation of highly sensitive detectors of electromagnetic radiation, calorimeters, parametric amplifiers, and magnetometers.
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BibTeX
@misc{vodolazov2026giant,
title = {{Giant nonlinearity of kinetic inductance in superconducting hybrid strip}},
author = {D. Yu. Vodolazov and Yu. P. Korneeva and M. A. Dryazgov and S. S. Ustavschikov and N. V. Porokhov and N. N. Osipov and I. Yu. Pashenkin and A. A. Korneev and M. A. Tarkhov},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.05903},
eprint = {2610.05903},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.05903},
}
RIS
TY - UNPB
TI - Giant nonlinearity of kinetic inductance in superconducting hybrid strip
AU - D. Yu. Vodolazov
AU - Yu. P. Korneeva
AU - M. A. Dryazgov
AU - S. S. Ustavschikov
AU - N. V. Porokhov
AU - N. N. Osipov
AU - I. Yu. Pashenkin
AU - A. A. Korneev
AU - M. A. Tarkhov
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2610.05903
UR - https://arxiv.org/abs/2610.05903
AB - We demonstrate giant nonlinearity of the kinetic inductance L_k in a superconducting NbN/Al hybrid strip. In contrast to ordinary superconductors, where the maximum observed current-induced variation of L_k does not exceed tens of percent, we observe a 50-fold change in L_k. Physically, this effect is connected with the proximity-induced superconductivity in the Al layer and the specific choice of parameters for which the dependence of the superconducting current I on the Cooper pair momentum ℏ q exhibits a plateau at a current I^* {\it well below} the depairing current. Formally, this leads to L_k ∼ dq/dI → ∞ as I → I^*. We believe that our results open a new route for creating the next generation of highly sensitive detectors of electromagnetic radiation, calorimeters, parametric amplifiers, and magnetometers.
ER -