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Altermagnetism in Modified Lieb Lattice Hubbard Model.

Nitin Kaushal1, Marcel Franz1

  • 1University of British Columbia, Department of Physics and Astronomy and Quantum Matter Institute, Vancouver, British Columbia V6T 1Z4, Canada.

Physical Review Letters
|October 25, 2025
PubMed
Summary
This summary is machine-generated.

Researchers explored altermagnetism in quasi-2D materials using the Lieb lattice model. They found a spin-1/2 altermagnetic Mott insulating state and evidence of altermagnetic metal behavior in doped systems.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Quantum Mechanics

Background:

  • Altermagnetism is a novel magnetic state with unique spin properties.
  • Quasi-2D oxychalcogenides with anti-CuO2 structures are potential platforms for exotic electronic phenomena.

Purpose of the Study:

  • To investigate the emergence of altermagnetism in electrons on the Lieb lattice.
  • To model quasi-2D anti-CuO2 lattice structures and their magnetic properties.

Main Methods:

  • Utilized unrestricted Hartree-Fock and exact diagonalization techniques.
  • Studied the Lieb lattice Hubbard model for electron interactions.
  • Constructed an effective spin-1/2 Heisenberg model.

Main Results:

  • Established a spin-1/2 altermagnetic Mott insulating ground state at electron densities of 2 and 4 per unit cell.
  • Observed characteristic spin splitting in both electron and magnon bands.
  • Provided evidence for altermagnetic metal formation in doped Mott states.

Conclusions:

  • The Lieb lattice Hubbard model hosts altermagnetic Mott insulating and metallic phases.
  • Spin splitting in electron and magnon bands confirms altermagnetic behavior.
  • Doped states exhibit unique Fermi surface characteristics with potential for novel electronic devices.