Extended Data Fig. 5: Enhancement of the critical temperature under in-plane magnetic field.
From: Tunable spin-polarized correlated states in twisted double bilayer graphene
a, Resistivity as a function of in-plane magnetic field across the half-filled insulator and superconducting-like state in the 1.26° device. b, Resistivity as a function of temperature and in-plane magnetic field at optimal doping and displacement field. TBKT denotes the BKT temperature extracted from nonlinear IV measurements. T50% marks the temperature where resistance is half of the normal resistance. c, Line traces at different in-plane magnetic fields. d, Illustration of pairing in spin-polarized superconductor. The blue (red) surface represents the spin down (up) electron band. The two bands are filled differently due to the parent ferromagnetic metallic state. The hexagon represents the Brillouin zone of graphene lattice. Pairing thus happens between Fermi surfaces of the same spin and opposite valleys.
