发表机构
Max Planck Institute for Chemical Physics of Solids; Institute of Solid State and Material Physics, Technische Universität Dresden; Institute of Applied Physics, Technische Universität Dresden; Leibniz Institute for Solid State and Materials Research Dresden; Department of Physics, University of Naples Federico II; Department of Electrical Engineering and Information Technology, University of Naples Federico II（马克斯·普朗克固体和化学物理研究所; 德累斯顿工业大学固态与材料物理研究所; 德累斯顿工业大学应用物理研究所; 德累斯顿莱布尼茨固体与材料研究所; 那不勒斯费德里科二世大学物理系; 那不勒斯费德里科二世大学电气与信息工程系）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究利用混合微波电路，通过将超导薄片集成到谐振器中，实现对 kagome 超导体无创探测，发现其低温超流体密度线性行为对应节点型能隙结构，为量子技术提供新平台。
AI 中文摘要
非常规超导电性是奇异量子物质的标志，确定其配对对称性对于揭示其微观起源至关重要。kagome 超导体为强电子关联和非平凡能带拓扑产生的新兴现象提供了丰富的研究平台，但其超导配对对称性仍难以捉摸。超导能隙结构通常通过电动力学响应进行探测，但此类测量因薄片体积小且性质脆弱而无法应用于薄片样品。超导微波谐振器提供了一种相干且高度灵敏的探测电动力学响应的平台，其灵活的设计可纳入多种材料和几何结构。在此，我们将薄片集成到微波电路中，通过非接触耦合实现对超流体响应的无创探测，同时保留样品结构完整性。通过设计器件几何结构以抑制微波电路中占主导损耗的寄生两能级系统损耗，我们分离出本征材料响应。值得注意的是，温度相关的超流体密度在低温下表现出线性行为，与节点型能隙结构一致。我们的方法建立了一种用于探测脆弱超导薄片电动力学响应的无创平台，同时推进了面向量子技术的混合微波架构。
英文摘要
Unconventional superconductivity is a hallmark of exotic quantum matter, where determining the pairing symmetry is essential for uncovering its microscopic origin. Kagome superconductors provide a fertile landscape for emergent phenomena arising from strong electronic correlations and nontrivial band topology, yet their superconducting pairing symmetry remains elusive. The superconducting gap structure is commonly probed via electrodynamic response, but such measurements are inapplicable to thin flakes due to their small volume and delicate nature. Superconducting microwave resonators offer a coherent and highly sensitive platform for probing electrodynamic responses, with versatile designs that enable incorporation of diverse materials and geometries. Here, we integrate flakes into microwave circuits, enabling noninvasive access to the superfluid response through contactless coupling that preserves structural integrity. By engineering the device geometry to suppress parasitic two-level-system losses that dominate dissipation in microwave circuits, we isolate the intrinsic material response. Remarkably, the temperature-dependent superfluid density exhibits linear behavior at low temperatures, consistent with a nodal gap structure. Our approach establishes a noninvasive platform for probing electrodynamic response of fragile superconducting flakes while advancing hybrid microwave architectures for quantum technologies.
