Work

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

Year: 2025

Type: article

Abstract: The electronic structure of the lightly hole-doped triangular-lattice moir\'e 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 $\ensuremath{\phi}$ 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 $\ensuremath{\phi}$ 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.

Source: Physical review. B./Physical review. B

DOI: 10.1103/22j6-2p89

Authors: V. I. Kuz'min, M. A. Visotin, S. G. Ovchinnikov

Institution: Siberian Federal University

Language: English

Topic: Physics of Superconductivity and Magnetism

Subfield: Condensed Matter Physics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funder: Russian Science Foundation

Award: G4284139730