On the nature of ferromagnetism in Ga_{1-x}Mn_xAs semiconductors

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dc.creatorda Silva, A. J. R.
dc.creatorFazzio, A.
dc.creatorSantos, R. R. dos
dc.creatorOliveira, L. E.
dc.date2003-07-29
dc.date.accessioned2026-07-07T02:52:40Z
dc.date.available2026-07-07T02:52:40Z
dc.descriptionWe have performed ab initio calculations within the density-functional theory for Ga_{1-x}Mn_xAs diluted semiconductors. Total energy results unambiguously show that a quasi-localized down-spin hole, with strong p-like character, surrounds the fully polarized Mn up-spin d^5-electrons. Calculations indicate that the holes form an essentially dispersionless impurity band, thus rendering effective-mass descriptions of hole states open to challenge. We obtain estimates both for the s = 1/2 hole and S = 5/2 Mn exchange coupling, and for the distance dependence of the effective Mn-Mn exchange interaction. Results demonstrate that the effective Mn-Mn coupling is always ferromagnetic, thus non-RKKY, and intermediated by the antiferromagnetic coupling of each Mn spin to the holes.
dc.descriptionRevTeX 4, 4 two-column pages, 3 .gif figures; submitted to Phys Rev Lett
dc.identifierhttps://arxiv.org/abs/cond-mat/0307714
dc.identifierhttp://arxiv.org/abs/cond-mat/0307714
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/21922
dc.subjectMaterials Science
dc.subjectStrongly Correlated Electrons
dc.titleOn the nature of ferromagnetism in Ga_{1-x}Mn_xAs semiconductors
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