AI 中文总结
该研究以三端YSR结为对象，利用磁场调控实现了非互易超电流输运，确立了其作为原子尺度工程非互易超导输运平台的潜力。
AI 中文摘要
超导表面上磁性吸附原子的扫描隧道显微镜（STM）研究已证实，Yu-Shiba-Rusinov（YSR）态是研究磁-超导相互作用和相位相干量子输运的通用平台。本文研究由三个BCS超导体（标记为'A'、'B'、'C'）构成的三端Josephson结中的非互易超电流输运，每个超导体耦合一对YSR态的磁性杂质。将电极'A'和'C'作为主要输运电极，电极'B'作为相位控制节点，我们证明了主电极间存在磁场可调的非互易超电流。该效应需同时满足：存在控制电极，且至少一个连接主电极的杂质处存在粒子-空穴对称性破缺；若无控制电极，超电流保持互易性。我们的结果确立了多端YSR结作为原子尺度工程非互易超导输运和对称性破缺现象的有前途平台。
英文摘要
Scanning tunneling microscopy (STM) of magnetic adatoms on superconducting surfaces has established Yu-Shiba-Rusinov (YSR) states as a versatile platform for studying magnetic-superconducting interactions and phase-coherent quantum transport. Here, we investigate nonreciprocal supercurrent transport in a three-terminal Josephson junction comprising three BCS superconductors (`A', `B' and `C'), each coupled to a magnetic impurity hosting a pair of YSR states. Treating terminals `A' and `C' as primary transport electrodes and terminal `B' as a phase-control node, we demonstrate field-tunable nonreciprocal supercurrent between the primary electrodes. This effect requires both: the control terminal and broken particle-hole symmetry at least in one impurity attached to a primary electrode. Without the control terminal we show that the supercurrent remains reciprocal. Our results establish multi-terminal YSR junctions as a promising platform for engineering nonreciprocal superconducting transport and symmetry-breaking phenomena at the atomic scale.
Comments6 pages, 3 figures
