Band structure and superconductivity in twisted trilayer graphene

Võ Tiến Phong; Pierre A. Pantaleón; Tommaso Cea; Francisco Guinea

doi:10.1103/PhysRevB.104.L121116

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Band structure and superconductivity in twisted trilayer graphene

Võ Tiến Phong, Pierre A. Pantaleón, Tommaso Cea, Francisco Guinea

DOI 10.1103/PhysRevB.104.L121116 · Physical Review B

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Abstract

We study the symmetries of twisted trilayer graphene's band structure under various extrinsic perturbations, and analyze the role of long-range electron-electron interactions near the first magic angle. The electronic structure is modified by these interactions in a similar way to twisted bilayer graphene. We analyze electron pairing due to long-wavelength charge fluctuations, which are coupled among themselves via the Coulomb interaction and additionally mediated by longitudinal acoustic phonons. We find superconducting phases with either spin-singlet/valley-triplet or spin-triplet/valley-singlet symmetry, with critical temperatures up to a few Kelvin for realistic choices of parameters.