Altermagnetism in Modified Lieb Lattice Hubbard Model
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
Summary
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.
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.
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