Metal-insulator transition and dominant $d+id$ pairing symmetry in twisted bilayer graphene

31 Mar 2020 Chen Wanying Chu Yonghuan Huang Tongyun Ma Tianxing

Motivated by recent experimental studies that have found signatures of a correlated insulator phase and tuning superconductivity in twisted bilayer graphene, we study the temperature-dependent conductivity, the spin correlation and the superconducting pairing correlation within a two-orbital Hubbard model on an emergent honeycomb lattice. The evaluation of the temperature dependence of the conductivity demonstrates that there is a metal-insulator transition, and the Mott phase at strong coupling is accompanied by antiferromagnetic order... (read more)

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