Imaging Magic-Angle Twisted Bilayer Graphene: Part II

The flat bands in magic-angle twisted bilayer graphene (MATBG) host exotic quantum phases, including correlated insulating states, topologically non-trivial phases, and unconventional superconductors [1,2]. Strong interactions between electrons modulate the ground state from which such correlated phases emerge, and reconstruct the local electronic structure along with spatial symmetry breaking [3,4]. The ability to measure the local electronic excitation spectrum allows scanning tunneling microscopy (STM) to investigate the spatial dependence of the local electronic density of states (LDOS) and visualize the spatial characteristics of correlated phases using a variety of imaging techniques.

In this second talk in a series of three presentations, I will present how we use STM imaging and tunneling spectroscopy measurements to uncover distinctive real-space features of correlated quantum phases that result from strong electron interactions. I will discuss how these real-space features vary on several length scales and will discuss how they change as a function of carrier density, twist angle, and strain.