Dresden 2026 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 28: Superconducting Electronics: SQUIDs and other Josephson Circuits and Components
TT 28.4: Vortrag
Dienstag, 10. März 2026, 10:15–10:30, CHE/0089
Tapping-mode SQUID-on-tip Microscopy with Proximity Josephson Junctions — •Matthijs Rog1, Tycho J. Blom1, Daan B. Boltje1,2, Milan P. Allan1,2,3, and Kaveh Lahabi1,2 — 1Institute of Physics, Leiden University, Leiden, The Netherlands — 2QuantaMap B.V., Leiden, The Netherlands — 3Faculty of Physics, Ludwig-Maximilians-University Munich, Munich, Germany
Understanding nanoscale dynamics in strongly correlated systems and quantum materials requires investigating the interplay between dissipation, magnetism and electronic transport. The local mapping of transport properties, such as current flow, and their relation to geometry and magnetism still remains a major challenge. Here, we introduce tapping-mode SQUID-on-tip, which combines atomic force microscopy (AFM) with nanoSQUID sensing. This microscope is able to simultaneously image magnetic flux, electrical currents, local heating and sample topography. Our probes minimize nanoSQUID-sample distance, provide in-plane magnetic sensitivity, and operate even on highly corrugated nanostructures and devices. Our fully electronic readout removes the need for optical elements and external radiation. By using proximity-junction nanoSQUIDs with large voltage output, we resolve nanoscale currents down to 100 nA using a simple four-probe electronic readout. In addition to demonstrating the technique, we will show the first applications to strongly correlated electron systems, where our microscope offers immediate new insights into the underlying physics.
[1] M. Rog et al., arXiv:2508.21575
Keywords: SQUID; Microscopy; Scanning Probe; Josephson Junctions; Quantum Materials