AI 中文总结
本研究在混合Al/InAs异质结中，通过集总元件谐振器的微波刚度测量，发现磁场下Bogoliubov费米面的出现，其各向异性演化由塞曼与轨道Fulde-Ferrell效应共同驱动，为探测混合系统各向异性无隙超导性提供了灵敏方法。
AI 中文摘要
我们研究了混合超导体/半导体异质结中邻近诱导的二维电子气的微波电动力学特性。通过使用电感导线相对于面内磁场取向的集总元件谐振器，我们借助动力学电感直接探测超流刚度。随着磁场增大，谐振频率呈现非单调且强各向异性的演化，仅用轨道对破坏无法解释该现象。我们证明此行为与Bogoliubov费米面的出现一致，该费米面会根据磁场方向选择性抑制超流响应。刚度张量的微观计算捕捉到了由塞曼效应和轨道Fulde-Ferrell效应相互作用驱动的观测到的各向异性。我们的结果确立了微波刚度测量作为探测混合系统中各向异性无隙超导性的灵敏手段。
英文摘要
We investigate the microwave electrodynamics of a proximitized two-dimensional electron gas in hybrid superconductor/semiconductor heterostructures. Using lumped-element resonators with inductor wires oriented relative to an in-plane magnetic field, we directly probe the superfluid stiffness via the kinetic inductance. As the field increases, the resonance frequency exhibits a non-monotonic and strongly anisotropic evolution that cannot be explained by orbital pair breaking alone. We show that this behavior is consistent with the emergence of Bogoliubov Fermi surfaces, which selectively suppress the supercurrent response depending on the direction of the magnetic field. Microscopic calculations of the stiffness tensor capture the observed anisotropy driven by the interplay of Zeeman and orbital Fulde-Ferrell effects. Our results establish microwave stiffness measurements as a sensitive probe of anisotropic gapless superconductivity in hybrid systems.
Comments8 pages, 4 figures and supplementary information
