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Moir\'e superlattices have recently emerged as a novel platform wherecorrelated physics and superconductivity can be studied with unprecedentedtunability. Although correlated effects have been observed in several othermoir\'e systems, magic-angle twisted bilayer graphene (MATBG) remains the onlyone where robust superconductivity has been reproducibly measured. Here werealize a new moir\'e superconductor, mirror symmetric magic-angle twistedtrilayer graphene (MATTG) with dramatically richer tunability in electronicstructure and superconducting properties. Hall effect and quantum oscillationsmeasurements as a function of density and electric field allow us to determinethe system's tunable phase boundaries in the normal state. Zero magnetic fieldresistivity measurements then reveal that the existence of superconductivity isintimately connected to the broken symmetry phase emerging from two carriersper moir\'e unit cell. Strikingly, we find that the superconducting phase getssuppressed and bounded at the van Hove singularities (vHs) partiallysurrounding the broken-symmetry phase, which is difficult to reconcile withweak-coupling BCS theory. Moreover, the extensive in situ tunability of oursystem allows us to achieve the ultra-strong coupling regime, characterized bya Ginzburg-Landau coherence length reaching the average inter-particle distanceand very large $T_\mathrm{BKT}/T_{F}$ ratios in excess of 0.1, where$T_\mathrm{BKT}$ and $T_F$ are the Berezinskii-Kosterlitz-Thouless transitionand Fermi temperatures, respectively. These observations suggest that MATTG canbe electrically tuned close to the two-dimensional BCS-BEC crossover. Ourresults establish a new generation of tunable moir\'e superconductors with thepotential to revolutionize our fundamental understanding and the applicationsof strong coupling superconductivity.

Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene