Imaging Quantum and Mesoscopic Phenomena with NanoSQUID on Tip Microscopy

Speaker: Evgeny Redekop, UC Santa Barbara
Understanding emergent electronic phases in low-dimensional materials requires experimental tools capable of probing local electromagnetic properties with nanometer resolution and high sensitivity. The nanoSQUID-on-tip (nSOT) is a scanning superconducting quantum interference device fabricated directly on the apex of a pulled quartz tip, enabling quantitative multimodal imaging at the nanoscale and cryogenic temperatures. In this talk, I will outline the nSOT’s working principle, fabrication, and readout schemes, emphasizing its versatility as a probe of correlated quantum states. I will present two recent applications: imaging fractional Chern insulators in twisted MoTe₂ and a new approach to mapping transport regimes in dual-gated Bernal bilayer graphene. I will also highlight emerging directions that extend the nSOT’s capabilities, demonstrating its potential as a universal platform for exploring quantum matter and mesoscopic electrodynamics.