Polarization Spectroscopy of an Isolated Quantum Dot and an Isolated Quantum Wire

Photoluminescence spectra of an isolated GaAs quantum dot within an AlGaAs quantum wire are studied. The examination of behavior of spectra in a magnetic field provided an opportunity to estimate the exciton binding energy in the quantum dot, which turned out to be 10 times higher than the bulk exci...

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Bibliographic Details
Published in:Physics of the solid state 2018-12, Vol.60 (12), p.2623-2627
Main Authors: Kats, V. N., Platonov, A. V., Tsyrlin, G. E., Buravlev, A. D., Delga, A., Besombes, L., Mariette, H., Kochereshko, V. P.
Format: Article
Language:English
Subjects:
ALUMINIUM ARSENIDES
BINDING ENERGY
Condensed Matter
Energy (Physics)
EXCITONS
Gallium arsenide
GALLIUM ARSENIDES
Linear polarization
Low-Dimensional Systems
MAGNETIC FIELDS
Materials Science
NANOSCIENCE AND NANOTECHNOLOGY
NANOWIRES
PHOTOLUMINESCENCE
Physics
Physics and Astronomy
POLARIZATION
POSITIONING
QUANTUM DOTS
QUANTUM WIRES
SIGNALS
Solid State Physics
SPECTRA
Spectrum analysis
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Summary:Photoluminescence spectra of an isolated GaAs quantum dot within an AlGaAs quantum wire are studied. The examination of behavior of spectra in a magnetic field provided an opportunity to estimate the exciton binding energy in the quantum dot, which turned out to be 10 times higher than the bulk exciton binding energy in GaAs. It is demonstrated that the signal of exciton photoluminescence from the quantum dot emitted along the nanowire axis is linearly polarized. At the same time, the photoluminescence signal propagating in the direction perpendicular to the nanowire axis is almost unpolarized. This may be attributed to the nonaxial dot positioning in the wire under a giant increase in the binding energy of an exciton affected by an image potential.
ISSN:1063-7834
1090-6460
DOI:10.1134/S1063783418120156