Resolving spectral gaps and many-body resonances in superconducting twisted trilayer graphene

Previous studies on magic-angle twisted trilayer graphene (MATTG) have reported the coexistence of symmetry-broken phases and robust superconductivity. Scanning tunneling spectroscopy (STS) further revealed a pseudogap that largely overlaps with the Kekulé reconstruction. Here, we perform STS measurements on twist-angle homogeneous MATTG sample tracking the formation sequence of correlated phases. First, we identify many-body resonance at intermediate temperatures resulting from the dynamic correlation between heavy and light fermions in MATTG. Upon further cooling, real-space dI/dV maps develop Kekulé reconstruction accompanied by the appearance of a pseudogap. At much lower temperatures, we observe a separate superconducting gap, indicating the pseudogap is more closely associated with a flavor-symmetry-broken phase. The emergence of a superconducting gap within the IVC-originated pseudogap highlights the interplay between dynamic correlations and symmetry breaking in driving superconductivity in MATTG.