Ising superconductivity induced from spin-selective valley symmetry breaking in twisted trilayer graphene.

ABSTRACT: We show that the e-e interaction induces a strong breakdown of valley symmetry for each spin channel in twisted trilayer graphene, leading to a ground state where the two spin projections have opposite sign of the valley symmetry breaking order parameter. This leads to a spin-valley locking in which the electrons of a Cooper pair are forced to live on different Fermi lines attached to opposite valleys. Furthermore, we find an effective intrinsic spin-orbit coupling explaining the protection of the superconductivity against in-plane magnetic fields. The effect of spin-selective valley symmetry breaking is validated as it reproduces the experimental observation of the reset of the Hall density at 2-hole doping. It also implies a breakdown of the symmetry of the bands from C₆ to C<

SUBMITTER: Gonzalez J 

PROVIDER: S-EPMC10182018 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature