发表机构
Institute of Nanotechnology of Microelectronics of the Russian Academy of Sciences（俄罗斯科学院微电子纳米技术研究所）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
该研究在NbN/Al混合超导条带中实现动生电感50倍巨变化，源于邻近效应与参数选择使电流-动量关系出现平台，为高灵敏电磁探测器等器件开辟新途径。
AI 中文摘要
我们展示了超导NbN/Al混合条带中动生电感$L_k$的巨非线性。与普通超导体（其中观测到的$L_k$最大电流诱导变化不超过百分之几十）相比，我们观测到$L_k$发生了50倍的变化。物理上，这一效应与Al层中的邻近诱导超导性以及参数的具体选择有关，在该参数下，超导电流$I$对库珀对动量$\hbar q$的依赖关系在电流$I^*$（远低于去配对电流）处呈现平台。形式上，这导致当$I \to I^*$时，$L_k \sim dq/dI \to \infty$。我们相信，我们的结果为创造下一代高灵敏度电磁辐射探测器、量热计、参量放大器和磁力计开辟了新途径。
英文摘要
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 $\hbar q$ exhibits a plateau at a current $I^*$ {\it well below} the depairing current. Formally, this leads to $L_k \sim dq/dI \to \infty$ as $I \to I^*$. 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.
Comments8 pages, 6 figures
