Scanning tunneling microscopy signatures of unconventional superconductivity in twisted trilayer graphene

Magic-angle twisted trilayer graphene stands out as a highly tunable material that exhibits strong electronic correlations and robust unconventional superconductivity. However, understanding the interplay between the low-temperature superconducting phase and the other correlated phases that form at higher temperatures remains elusive. In this talk, we will review signatures of unconventional superconductivity as observed by scanning tunneling microscopy and spectroscopy. In particular, we will focus on a doping range where two spectroscopic gaps centered around the Fermi level can be identified. In this range, further measurements in a finite magnetic field, elevated temperatures, and in the contact regime enable us to discern the origin of the two gaps. Finally, we will show how the spatial variation of the gaps on the atomic scale provides further insights into the nature of superconductivity and its rich intertwinement with other correlated phases in the system.