Scanning quantum microscopy for emergent phases of matter

Visualization of nanoscale magnetic response in condensed matter systems provides a pathway to unravel the underlying mechanisms of spin interactions. The two-dimensional (2D) materials provide controlled and versatile platforms for exploring exotic correlated and topological states. In the initial segment of our study, I will present a recent breakthrough involving the twisted double bilayer CrI₃. Our investigation brings to light the softening of magnetic anisotropy and the heightened magnetic competition at a small twisted angle. This magnetic competition manifests as a spontaneous super-Moire magnetic texture with a dis- tinctive period, setting it apart from the Moire periodicity associated with the given twisted angle. Transitioning to the second part of my exploration, I will extend the inquiry into the realm of 2D superconducting systems. I will share insights into the dynamics of vortices in a few nm thin exfoliated 2H-NbSe₂. A noteworthy observation is the melting of vortex solids near the critical temperature, facilitating the re-arrangement of vortices and unconventional magnetic noise in different cool-down cycles.