发表机构
Temple University; Diamond Light Source Ltd.; Advanced Light Source, Lawrence Berkeley National Laboratory; Max Planck Institute for Solid State Research; Institute of Crystallography, Italian National Research Council, IC-CNR; Rome International Center for Materials Science Superstripes, RICMASS（天普大学; 钻石光源有限公司; 劳伦斯伯克利国家实验室先进光源中心; 马克斯·普朗克固态研究所; 意大利国家研究委员会晶体学研究所; 罗马国际材料科学超条带研究中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究结合HAXPES与偏振依赖XAS，探究LSCO/LCO人工高Tc超晶格中$L/d$调控超导穹顶的电子结构演化，揭示了与Fano-Feshbach共振超导电性相关的光谱特征。
AI 中文摘要
通过量子材料设计制备的La$_{1.55}$Sr$_{0.45}$CuO$_4$/La$_2$CuO$_4$（LSCO/LCO）人工高Tc超晶格（AHTS）中，超导穹顶可通过改变几何比例$L/d$进行调控，其中$L$为LCO层厚度，$d$为超晶格纳米尺度周期。本研究结合硬X射线光电子能谱（HAXPES）与偏振依赖软X射线吸收谱（XAS），探测$L/d$调控的超导穹顶范围内电子结构的演化规律。研究观测到该系列样品存在系统的化学势演化，同时费米能级附近谱权重增强、局域与非局域屏蔽信号提升，以及穹顶顶部附近面内轨道极化增强。这些光谱信号为理解LSCO/LCO AHTS系列中Fano-Feshbach共振超导电性的出现提供了见解。
英文摘要
In La$_{1.55}$Sr$_{0.45}$CuO$_4$/La$_2$CuO$_4$ (LSCO/LCO) artificial high-$T_c$ superlattices (AHTS), grown by quantum material design, the superconducting dome can be tuned by varying the geometric ratio $L/d$, where $L$ is the LCO layer thickness and $d$ is the superlattice nanoscale period. Here, we combine hard X-ray photoelectron spectroscopy (HAXPES) and polarization-dependent soft X-ray absorption spectroscopy (XAS) to probe how the electronic structure evolves across the $L/d$-tuned superconducting dome. We observe systematic chemical-potential evolution across the series, together with enhanced spectral weight near the Fermi level, enhanced local and non-local screening signatures, and increased in-plane orbital polarization near the top of the dome. Together, these spectroscopic signatures provide insight into the emergence of Fano-Feshbach resonant superconductivity in the LSCO/LCO AHTS series.
