Confinement engineering of s-d exchange interactions in Ga1-x Mnx As/Aly Ga1-y As quantum wells

N. P. Stern*, R. C. Myers, M. Poggio, A. C. Gossard, D. D. Awschalom

*Corresponding author for this work

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

Recent measurements of coherent electron spin dynamics reveal an antiferromagnetic s-d exchange coupling between conduction-band electrons and electrons localized on Mn2+ impurities in Ga1-x Mnx As quantum wells. Here we discuss systematic measurements of the s-d exchange interaction in Ga1-x Mnx As/Aly Ga1-y As quantum wells with different confinement potentials using time-resolved Kerr rotation. Extending previous investigations of the dependence of the s-d exchange, N0 α, on well width, we find that its magnitude also depends on well depth. Both phenomena reduce to a general dependence on confinement energy, described by a band-mixing model of confinement-induced kinetic exchange in the conduction band.

Original languageEnglish (US)
Article number045329
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number4
DOIs
StatePublished - Jan 29 2007

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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