Quantum topological transitions and spinons in metallic ferro- and antiferromagnets

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.

arXiv comment5 pages, Physics Letters A, the printed version is slightly corrected and extended

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Cited by in corpus (4)

• Electronic States and Anomalous Hall Effect in Strongly Correlated Topological Systems
• Hubbard bands, Mott transition and deconfinement in strongly correlated systems
• Hubbard Bands and Exotic States in Doped and Undoped Mott Systems: The Kotliar-Ruckenstein Representation
• Magnetism, non-Fermi-liquid behavior and deconfinement in Kondo lattices