Saturated ferromagnetism from statistical transmutation

The magnetic properties of the ground state are studied in the U → ∞ Hubbard model with uniform magnetic flux perpendicular to a square lattice, in the absence of Zeeman coupling. It is found that the saturated ferromagnetism emerges in a rather wide region in the space of the flux density φ and the...

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Bibliographic Details
Published in:Journal of magnetism and magnetic materials 2007-03, Vol.310 (2), p.1076-1078
Main Authors: Saiga, Y., Oshikawa, M.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Exact sciences and technology
Ferromagnetism
General theory and models of magnetic ordering
Magnetic properties and materials
Physics
Spin chirality
Statistical transmutation
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Summary:The magnetic properties of the ground state are studied in the U → ∞ Hubbard model with uniform magnetic flux perpendicular to a square lattice, in the absence of Zeeman coupling. It is found that the saturated ferromagnetism emerges in a rather wide region in the space of the flux density φ and the electron density n e space. In particular, the saturated ferromagnetism at φ = n e is induced by the formation of a spin- 1 2 boson, which is a composite of an electron and the unit flux quantum. This ferromagnetism is overcome by the chiral spin order in a certain range of n e .
ISSN:0304-8853
DOI:10.1016/j.jmmm.2006.10.263