Quantum topological transitions and spinons in metallic ferro- and antiferromagnets
arXiv:1903.11003 · doi:10.1016/j.physleta.2019.01.055
Abstract
An effective Hamiltonian describing fluctuation effects in the magnetic phases of the Hubbard model in terms of spinon excitations is derived. A comparison of spin-rotational Kotliar-Ruckenstein slave boson and Ribeiro-Wen dopon representations is performed. The quantum transition into the half-metallic ferromagnetic state with vanishing of spin-down Fermi surface is treated as the topological Lifshitz transition in the quasimomentum space. The itinerant-localized magnetism transitions and Mott transition in antiferromagnetic state are considered in the topological context. Related metal-insulator transitions in Heusler alloys are discussed.
5 pages, Physics Letters A, the printed version is slightly corrected and extended
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