Effective interaction Hamiltonian of polaron pairs in diluted magnetic semiconductors

D. E. Angelescu, Ravindra N. Bhatt

Research output: Contribution to journalArticle

35 Scopus citations

Abstract

The magnetic interaction of a pair of bound magnetic polarons in diluted magnetic semiconductors is analyzed via a generalized Hubbard-type Hamiltonian for two carriers in the presence of effective magnetic fields arising from the magnetic polarization of their respective polarons. For the case where the magnetic fields at the two sites have equal magnitude but are allowed to have arbitrary directions, it is shown that the energy of the two polarons is minimized for a ferromagnetic configuration of the carrier spins (in contrast to the case of hydrogenic centers in nonmagnetic semiconductors) if polaron fields are strong enough. A modified Heisenberg-type Hamiltonian is constructed to describe the low energy states of the resulting system.

Original languageEnglish (US)
Article number075211
Pages (from-to)752111-752118
Number of pages8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume65
Issue number7
StatePublished - Feb 15 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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