Hybrid Scanning SET–Hall Probe for Dual Electronic and Magnetic Imaging

Correlated electronic and magnetic phenomena lie at the heart of many emergent quantum materials, yet simultaneous access to their local electronic and magnetic responses remains an experimental challenge. We present progress toward an on-chip scanning sensor that integrates a single-electron transistor (SET) with a Hall-probe for concurrent measurements of local electronic and magnetic signals. The SET provides high charge-sensitivity visualizing electronic correlations, while the Hall sensor offers direct magnetic detection that is not limited to low magnetic fields. Our approach employs submicron fabrication of both probes in close proximity on a GaAs wafer, enabling spatially resolved and co-registered measurements. I will discuss device design, fabrication, and initial results benchmarking the SET–Hall probe architecture, highlighting its potential for simultaneous and spatially resolved measurement of coupled electromagnetic phenomena.