Three critical displacement fields in magic-angle twisted trilayer graphene

Gate-tunable double-dome superconductivity has been observed in magic-angle twisted trilayer graphene (MATTG). This double-dome feature appears only within a narrow range of displacement fields. In MATTG, the displacement field not only hybridizes the Dirac and flat bands but also modulates the bandwidth of the flat band itself, thereby tuning the strength of electronic interactions. Here, we perform transport measurements on MATTG devices and identify three critical displacement fields: one associated with a Lifshitz transition where the Dirac Fermi surface vanishes, one corresponding to the disappearance of correlated states at filling factor v = −3, and one marking the onset of double-dome superconductivity. These three critical displacement fields occur at nearly the same value. Disentangling the connections among them will deepen our understanding of superconductivity in moiré graphene systems.