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Near-field photoluminescence spectroscopy of localized states in InGaAsN alloys

  • A. M. Mintairov (a1) (a2), P. A. Blagnov (a2), T. Kosel (a1), J. L. Merz (a1), V. M. Ustinov (a2), A. S. Vlasov (a1) and R. E. Cook. (a3)...

Abstract

We used near-field magneto-photoluminescence scanning microscopy to study structural and optical properties of quantum-dot-like compositional fluctuations in GaAsN and InGaAsN alloys. We show that these fluctuations manifest themselves by the appearance of narrow emission lines (halfwidth 0.5−2 meV) at temperatures below 70K. We estimated the size, density, and nitrogen excess of individual compositional fluctuations (clusters), revealing phaseseparation effects in the distribution of nitrogen in GaAsN and InGaAsN. We found a dramatic difference in the Zeeman splitting of cluster lines between GaAsN and InGaAsN, indicating a strong effect of In on the exciton g-factor.

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