通过扫描探针量子传感可视化扭转铜氧化物超导体中的手性边缘模式

中文摘要 AI 辅助

近年来，由扭转范德华（vdW）异质结构承载的非传统超导性因其奇异的配对对称性、电子相互作用和非平凡拓扑性质而受到极大关注，这些性质与快速发展的量子技术自然相关。在此，我们报告了扭转vdW铜氧化物超导体纳米尺度电磁行为的扫描探针量子传感研究。利用单自旋弛豫测量法，我们直接可视化了在扭转Bi2Sr2CaCu2O8+x（BSCCO）中自发形成的边缘模式。通过研究边缘态诱导的量子自旋弛豫随温度的变化，我们实验评估了扭转BSCCO中节点处打开的非平凡拓扑带隙的大小及其在不同扭转角下的临界温度行为。我们进一步观察到由边缘模式定义的交替手性畴，探索了45°扭转BSCCO中面内磁场诱导拓扑性的实验特征。我们的结果推进了当前对扭转vdW节点超导体的理解，为前沿量子创新提供了一个有吸引力的高温拓扑超导材料平台。

英文摘要

Recently, unconventional superconductivity hosted by twisted van der Waals (vdW) heterostructures has received immense interest due to the exotic pairing symmetry, electronic interactions and nontrivial topological nature that are naturally relevant to the fast-advancing quantum technologies. Here, we report scanning-probe quantum sensing of nanoscale electromagnetic behaviors of twisted vdW cuprate superconductors. Using single-spin relaxometry, we directly visualize edge modes spontaneously formed in twisted Bi2Sr2CaCu2O8+x (BSCCO). By investigating temperature dependent variations of edge-state-induced quantum spin relaxation, we experimentally evaluate the magnitude of nontrivial topological band gap opened at nodal points in twisted BSCCO and its critical temperature behaviors under different twist angles. We further observe alternating chiral domains defined by edge modes, exploring experimental signatures of in-plane magnetic field-induced topology in 45° twisted BSCCO. Our results advance the current understanding of twisted vdW nodal superconductors, presenting an appealing high-temperature topological superconducting material platform for cutting-edge quantum innovation.

发表机构

• Georgia Institute of Technology（佐治亚理工学院）
• Harvard University（哈佛大学）
• National Institute for Materials Science（国立材料研究所）
• Brookhaven National Laboratory（布鲁克海文国家实验室）
• Argonne National Laboratory（阿贡国家实验室）

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