Ferromagnetism in doped semiconductors without magnetic ions

R. N. Bhatt, Erik Nielsen

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

While ferromagnetism has been obtained above 100 K in doped semiconductors with magnetic ions such as Ga1-xMnxAs, bulk doped semiconductors in the absence of magnetic ions have shown no tendency towards ferromagnetism. We re-examine the nonmagnetic doped semiconductor system at low carrier densities in terms of a generalized Hubbard model. Using exact diagonalization of the many-body Hamiltonian for finite clusters, we find that the system exhibits significant ferromagnetic tendencies at nanoscales, in a region of parameter space not accessible to bulk systems, but achievable in quantum dots and heterostructures. Implications for studying these effects in experimentally realizable systems, as well as the possibility of true (macroscopic) ferromagnetism in these systems is discussed.

Original languageEnglish (US)
Title of host publicationCondensed Matter Theories
PublisherWorld Scientific Publishing Co.
Pages307-318
Number of pages12
Volume23
ISBN (Electronic)9789812836625
ISBN (Print)9812836616, 9789812836618
DOIs
StatePublished - Jan 1 2008

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Engineering(all)
  • Materials Science(all)
  • Physics and Astronomy(all)

Keywords

  • Disordered hubbard model
  • Nagaoka ferromagnetism
  • Quantum dots
  • Shallow impurities

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  • Cite this

    Bhatt, R. N., & Nielsen, E. (2008). Ferromagnetism in doped semiconductors without magnetic ions. In Condensed Matter Theories (Vol. 23, pp. 307-318). World Scientific Publishing Co.. https://doi.org/10.1142/9789812836625_0032