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  • Letter
  • Open Access

Itinerant magnetism in the triangular-lattice Hubbard model at half doping: Application to twisted transition metal dichalcogenides

Yuchi He1,*, Roman Rausch2, Matthias Peschke3,4, Christoph Karrasch2, Philippe Corboz3, Nick Bultinck5, and S. A. Parameswaran1

  • *Contact author: yuchi.he@physics.ox.ac.uk
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Phys. Rev. B 113, L041107 – Published 6 January, 2026

DOI: https://doi.org/10.1103/1k49-msfx

Abstract

We use unrestricted Hartree-Fock, density matrix renormalization group, and variational projected entangled-pair state calculations to investigate the ground-state phase diagram of the triangular-lattice Hubbard model at “half doping” relative to single occupancy, i.e., at fillings of (1±12) electrons per site. The electron-doped case has a nested Fermi surface in the noninteracting limit, and hence a weak-coupling instability toward density-wave orders whose wave vectors are determined by Fermi-surface nesting conditions. We find that at moderate-to-strong interaction strengths, other spatially modulated orders arise, with wave vectors distinct from the nesting vectors. In particular, we identify a series of closely competing, itinerant long-wavelength magnetically ordered states, yielding to uniform ferromagnetic order at the largest interaction strengths. For half-hole doping and a similar range of interaction strengths, our data indicate that magnetic orders are most likely absent.

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Phys. Rev. B 113, L041107– Published 6 January, 2026
  • Received 31 January 2024
  • Revised 10 November 2025
  • Accepted 5 December 2025
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