Pseudogap in the lightly hole-doped triangular-lattice moiré Hubbard model

Kuz’min, V.I., Visotin, M.A., Ovchinnikov, S.G.// Physical Review B//

The electronic structure of the lightly hole-doped triangular-lattice moiré Hubbard model is studied within cluster perturbation theory (CPT) using 13-site clusters for a fixed doping concentration varying the Coulomb parameter and the hopping phase parameter related to the spin-orbital interaction. We have also developed a rather simple generalized mean-field approximation (GMFA) containing the amplitude of the spin correlations as a free parameter to fit the CPT this http URL evolution of the Fermi surface and the pseudogap with the parameters and is explained from the viewpoint of the short-range magnetic order. The geometric frustration and the additional model parameter related to the spin-orbital interaction result in a more rich physics of the pseudogap state compared to the case of a more conventional square lattice.