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

2025/07/13 by Kuz'min, V. I., Visotin, M. A., Ovchinnikov, S. G.
#FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el)

paper · doi:10.48550/arxiv.2507.09586

Abstract

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 p=1/13 varying the Coulomb parameter U and the hopping phase parameter ϕ 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 data.The evolution of the Fermi surface and the pseudogap with the parameters ϕ and U 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.

Citations

• Crucial role of thermal fluctuations and vertex corrections for the magnetic pseudogap
• Determinantal Quantum Monte Carlo solver for Cluster Perturbation Theory
• Correlated electronic phases in twisted bilayer transition metal dichalcogenides
• The pseudogap in high-temperature superconductors: an experimental survey

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