Strong Correlations and d+id Superconductivity in Twisted Bilayer Graphene

Understand

We compute the phase diagram of twisted bilayer graphene near the magic angle where the occurrence of flat bands enhances the effects of electron-electron interactions and thus unleashes strongly-correlated phenomena.

• Most importantly, we find a crossover between d+id superconductivity and Mott insulating behavior near half-filling of the lowest electron band when the temperature is increased.
• This is consistent with recent experiments.
• Our results are obtained using unbiased many-body renormalization group techniques combined with a mean-field analysis of the effective couplings.