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

58 Scopus citations

Abstract

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
Volume95
Issue number1
DOIs
StatePublished - Jul 1 2005

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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