Search for Nagaoka ferromagnetism in non-magnetic doped semiconductors

While ferromagnetism at relatively high temperatures is seen in diluted magnetic semiconductors such as Ga 1 - x Mn x As , under certain conditions semiconductors doped with non-magnetic impurities may also exhibit a ferromagnetic ground state. We investigate the possibility of ferromagnetism in a g...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2008-04, Vol.403 (5), p.1508-1510
Main Authors: Bhatt, R.N., Nielsen, E.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Doped semiconductors
Exact sciences and technology
Ferromagnetism
Hubbard model
Magnetic properties and materials
Magnetic semiconductors
Physics
Studies of specific magnetic materials
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Summary:While ferromagnetism at relatively high temperatures is seen in diluted magnetic semiconductors such as Ga 1 - x Mn x As , under certain conditions semiconductors doped with non-magnetic impurities may also exhibit a ferromagnetic ground state. We investigate the possibility of ferromagnetism in a generalized disordered Hubbard model designed to characterize hydrogenic centers in semiconductors. We demonstrate the occurrence of high spin ground states in clusters (e.g. doped quantum dots), and discuss the nature of the single-particle states in a positionally disordered three-dimensional system with a maximally spin-polarized ground state. In particular, we identify the mobility edges, and describe their dependence on impurity density and potential.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2007.10.366