Tuning Superconductivity in Spin-Orbit Bernal Bilayer Graphene by Interfacial Twisting

Bernal bilayer graphene (BLG) coupled to tungsten diselenide (WSe₂) features an extraordinary order-of-magnitude enhancement in superconducting T_c and establishes an ultra-clean platform for exploring various correlated ground states. Here, we show that by controlling the interfacial twist angle between BLG and WSe₂, the proximitized spin-orbit coupling (SOC) as well as overall BLG phase diagram can be tuned. We map out the superconducting regions and find that superconductivity exhibits a higher T_c and onsets at higher displacement fields when Ising SOC is increased. Moreover, we discover multiple superconducting regions emerging from various broken-symmetry parent phases. By carefully mapping quantum oscillations, we further establish the dependence of nematic broken flavor symmetry on doping and the Ising strength. Our results pave the way for a detailed understanding of unconventional pairing in graphene superconductors.