Search for Nagaoka ferromagnetism in non-magnetic doped semiconductors

Ravindra N. Bhatt, E. Nielsen

Research output: Contribution to journalArticle

Abstract

While ferromagnetism at relatively high temperatures is seen in diluted magnetic semiconductors such as Ga1 - x Mnx 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.

Original languageEnglish (US)
Pages (from-to)1508-1510
Number of pages3
JournalPhysica B: Condensed Matter
Volume403
Issue number5-9
DOIs
StatePublished - Apr 1 2008

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Keywords

  • Doped semiconductors
  • Ferromagnetism
  • Hubbard model

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