Antiferromagnetic s-d exchange coupling in GaMnAs

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

59 Scopus citations


Measurements of coherent electron spin dynamics in Ga1-xMnxAs/Al0.4Ga0.6As quantum wells with 0.0006%<x<0.03% show an antiferromagnetic (negative) exchange between s-like conduction band electrons and electrons localized in the d shell of the Mn2+ impurities. The magnitude of the s-d exchange parameter, N0, varies as a function of well width indicative of a large and negative contribution due to kinetic exchange. In the limit of no quantum confinement, N0 extrapolates to -0.09 0.03eV indicating that antiferromagnetic s-d exchange is a bulk property of GaMnAs. Measurements of the polarization-resolved photoluminescence show strong discrepancy from a simple model of the exchange enhanced Zeeman splitting, indicative of additional complexity in the exchange split valence band.

Original languageEnglish (US)
Article number017204
JournalPhysical review letters
Issue number1
StatePublished - Jul 1 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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