AI 中文总结
本研究展示了基于NbN纳米线的表面声波换能器，通过匹配电磁与声波相速度实现了低温ScAlN/SiC声学延迟线，实验证实其性能可用于低温信号处理及超导量子电路集成。
AI 中文摘要
本研究展示了一种基于超导氮化铌（NbN）纳米线的表面声波换能器，可在碳化硅（SiC）衬底上的氮化铝钪（ScAlN）中实现低温声学延迟线。超导纳米线沿声波传播轴降低了有效电磁相速度，使其与表面声波的相速度匹配，从而使共传播的电信号能沿纳米线长度持续且相干地驱动声波。研究通过耦合全波电磁与压电有限元法（FEM）模拟验证了工作原理，随后实验证实了一条500μm长的延迟线，其延迟时间达125 ns，在0.9 K温度下于0.5-20 GHz宽带范围内实现了换能，确立了超导纳米线作为一类新兴声学换能器的地位，对低温信号处理及与超导量子电路的集成具有直接意义。
英文摘要
This work presents the demonstration of a superconducting niobium nitride (NbN) nanowire surface acoustic wave transducer, enabling a cryogenic acoustic delay line in scandium aluminum nitride (ScAlN) on silicon carbide (SiC). The superconducting nanowire slows the effective electromagnetic phase velocity along the acoustic wave propagation axis to match that of the surface acoustic wave, such that the co-propagating electrical signal continuously and coherently drives the acoustic wave along the length of the wire. The operating principle is validated through coupled full-wave electromagnetic and piezoelectric finite element method simulations and then experimentally confirmed through demonstration of a 500 μm delay line exhibiting a 125 ns time delay, with broadband transduction characterized across 0.5-20 GHz at 0.9 K, establishing superconducting nanowires as an emerging class of acoustic transducers with direct implications for cryogenic signal processing and integration with superconducting quantum circuits.
Comments10 pages, 7 figures
