Near-field magnetophotoluminescence spectroscopy of composition fluctuations in InGaAsN

Near-field magnetophotoluminescence spectroscopy of composition fluctuations in InGaAsN

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 li...

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Bibliographic Details
Published in:Physical review letters Vol. 87; no. 27 Pt 1; p. 277401
Main Authors: Mintairov, A M, Kosel, T H, Merz, J L, Blagnov, P A, Vlasov, A S, Ustinov, V M, Cook, R E
Format: Journal Article
Language:English
Published: United States 31-12-2001
Subjects:
ALLOYS
BOWING
DISTRIBUTION
EXCITONS
FLUCTUATIONS
MICROSCOPY
NITROGEN
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
SPECTRA
SPECTROSCOPY
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Summary: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.
Bibliography:ObjectType-Article-1
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USDOE Office of Science (SC)
NATO
ANL/MSD/JA-41767
OUS
DE-AC02-06CH11357
ISSN:0031-9007
1079-7114
DOI:10.1103/physrevlett.87.277401