Quantum Twisting Microscopy of Magic-Angle Graphene: Imaging Interaction Effects in Momentum Space

Electron interactions fundamentally reshape the energy bands of quantum materials, often giving rise to correlated and topological phases. Magic-angle twisted bilayer graphene (MATBG) is a prime example, where flat bands host superconductivity, correlated insulators, and other emergent states — yet the momentum-space structure of these interacting bands has remained difficult to access. In this talk, I will present momentum-resolved measurements of MATBG using the Quantum Twisting Microscope, which enables direct imaging of the electronic bands with high energy and momentum resolution. Away from the magic angle, the measured bands agree with single-particle theory, whereas at the magic angle, we observe a striking redistribution of spectral weight between light and heavy electronic sectors across momentum space. Upon doping, these sectors exhibit bandwidth renormalisation, Mott-like cascades, Dirac revivals, and a persistent low-energy excitation associated with the heavy states. In the talk, I will show how this momentum-space picture clarifies the origin of the light and heavy sectors and how their interplay underlies the correlated behaviour of MATBG.