Magnons in multiorbital Hubbard models, from Lieb to kagome
The study investigates magnetic orders and excitations in a Hubbard model that smoothly transitions between Lieb and kagome lattices by varying hopping ($t'$). Using Hartree-Fock and RPA methods, researchers mapped the phase diagram to find critical interaction points where magnetism emerges. The work identifies specific magnetic states, such as ferrimagnetic solutions and altermagnetic phases, alongside their unique magnon energy spectra.