Fabrication and Application of Nano-SQUID Magnetometer to Scanning Imaging of Two-Dimensional Quantum Materials  

作　　者：Bingke Xiang Yihua Wang Hao Li Shane A.Cybart 

机构地区：[1]Shanghai Research Center for Quantum Sciences,Shanghai 201315,China [2]State Key Laboratory of Surface Physics and Department of Physics,Fudan University,Shanghai 200433,China [3]Shanghai Institute of Microsystem and Information Technology,National Key Laboratory of Materials for Integrated Circuits,Chinese Academy of Sciences(CAS),Shanghai 200050,China [4]2020 X-Lab,Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences,Shanghai 200050,China [5]CAS Center for Excellence in Superconducting Electronics,Shanghai 200050,China [6]Electrical and Computer Engineering,University of California Riverside,Riverside,CA 92521,USA

出　　处：《Electromagnetic Science》2024年第2期21-35,共15页电磁科学（英文）

基　　金：Yihua Wang would like to acknowledge support by Shanghai Municipal Science and Technology Major Project(Grant No.2019SHZDZX01);the National Key R&D Program of China(Grant No.2021YFA1400100);the National Natural Science Foundation of China(Grant No.12150003);Hao Li thanks the National Natural Science Foundation of China(Grant No.62201556);the Shanghai Pujiang Program(Grant No.22PJ1415200)for financial support.

摘　　要：Superconducting quantum interference devices(SQUIDs)are directly sensitive to magnetic flux.Nano-fabricated SQUID chip with miniaturized superconducting circuits can be further utilized as scanning probes for imaging of materials.Scanning SQUID microscopy(SSM)combines both high spatial resolution and high magnetic field sensitivity and is especially suitable for studying low dimensional materials with small sensing volumes.Here,we briefly review the fabrication of different types of nano-SQUIDs and the recent progress of utilizing them for scanning microscopy of quantum materials.We focus on but are not limited to topological states,unconventional superconductivity and exotic magnetism with a particular interest in two-dimensional materials.The magnet-ometry,susceptometry and current imaging modes of the SSM coupled with the external tuning of the material by magnetic field,electrical field gating and strain reveals a multitude of information beyond the scopes of charge-sensing probes.

关 键 词：JOSEPHSON JUNCTIONS Focused ion beam Scanning SQUID microscopy TWO-DIMENSIONAL QUANTUM MATERIALS 

分 类 号：O41[理学—理论物理]