title: Near-field magnetophotoluminescence spectroscopy of composition fluctuations in InGaAsN.
abstract: The localization of excitons on quantum-dot-like compositional fluctuations has been observed in temperature-dependent near-field magnetophotoluminescence spectra of InGaAsN. Localization is driven by the giant bowing parameter of these alloys and manifests itself by the appearance of ultranarrow lines (half-width <1 meV) at temperatures below 70 K. We show how near-field optical scanning microscopy can be used for the estimation of the size, density, and nitrogen excess of individual compositional fluctuations (clusters), thus revealing random versus phase-separation effects in the distribution of nitrogen.
authors.affiliation: EE Department, University of Notre Dame, Notre Dame, Indiana 46556, USA.
authors.forename: A M
authors.initials: AM
authors.lastname: Mintairov
authors.forename: T H
authors.initials: TH
authors.lastname: Kosel
authors.forename: J L
authors.initials: JL
authors.lastname: Merz
authors.forename: P A
authors.initials: PA
authors.lastname: Blagnov
authors.forename: A S
authors.initials: AS
authors.lastname: Vlasov
authors.forename: V M
authors.initials: VM
authors.lastname: Ustinov
authors.forename: R E
authors.initials: RE
authors.lastname: Cook