Studying Quantum Materials with Scanning SQUID Microscopy

<p>Electronic correlations give rise to fascinating macroscopic phenomena such<br> as superconductivity,magnetism, and topological phases of matter. Although<br> these phenomena manifest themselves macroscopically, fully understanding<br> the underlying microscopic mechanisms often requires probing on multiple<br> length scales. Spatial modulations on the mesoscopic scale are especially<br> challenging to probe, owing to the limited range of suitable experimental<br> techniques. Here, we review recent progress in scanning superconducting<br> quantum interference device (SQUID) microscopy. We demonstrate how<br> scanning SQUID combines unmatched magnetic field sensitivity and highly<br> versatile designs, by surveying discoveries in unconventional superconductivity,<br> exotic magnetism, topological states, and more. Finally, we discuss how<br> SQUID microscopy can be further developed to answer the increasing demand<br> for imaging new quantum materials.</p>