石墨烯约瑟夫森结中超导电流的扫描门显微镜调制
Scanning Gate Microscopy Modulation of Supercurrent in Graphene Josephson Junctions
AI总结：
本研究采用扫描门显微镜探究hBN封装的铌接触石墨烯约瑟夫森结的超导电流调制，实验与数值模拟吻合，为超导现象局域操控奠定基础。
AI中文摘要：
石墨烯约瑟夫森结因兼具高载流子迁移率、弹道输运特性及可通过栅极调控的临界电流（即使在量子化磁场下仍能保持），成为量子技术的优异平台。研究超导电流的空间分布对阐明输运机制、推进器件工程至关重要。本研究采用扫描门显微镜，探究由铌电极接触、hBN封装的石墨烯约瑟夫森结中的超导电流输运，研究超导电流随施加的针尖电压偏置及针尖-样品间距的调制规律，完成针尖诱导调制的完整表征。实验结果与数值模拟定量吻合，为实现具有空前空间分辨率的栅极可调超导现象的局域映射与操控奠定基础。
英文摘要：
Graphene Josephson junctions represent an excellent platform for quantum technologies, thanks to the combination of high carrier mobility, ballistic transport, and large gate-tunable critical currents, preserved even under quantizing magnetic fields. Investigating the spatial distribution of supercurrent flow could be crucial for elucidating transport mechanisms and advancing the engineering of these devices. In this work, we employ a Scanning Gate Microscope to investigate supercurrent transport in hBN-encapsulated graphene Josephson junctions contacted by Niobium leads. We study the supercurrent modulation as a function of the applied tip voltage bias and tip-to-sample distance, and provide a complete characterization of the tip-induced modulation. Our experimental results are quantitatively consistent with numerical simulations and pave the way towards local mapping and manipulation of gate-tunable superconducting phenomena with unprecedented spatial resolution.
