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

Journal Article · Sat Dec 15 04:00:00 EST 2018 · Physics of the Solid State

DOI:https://doi.org/10.1134/S1063783418120156· OSTI ID:22923134

Platonov, A. V.; Tsyrlin, G. E.; Buravlev, A. D. ^[1]; Delga, A.; Besombes, L.; Mariette, H. ^[2]; Kochereshko, V. P. ^[1]

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1. Ioffe Institute (Russian Federation)
2. Institut Néel (France)

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.

• OSTI ID: 22923134
• Journal Information: Physics of the Solid State, Journal Name: Physics of the Solid State Journal Issue: 12 Vol. 60; ISSN 1063-7834
• Country of Publication: United States
• Language: English

Related Subjects

77 NANOSCIENCE AND NANOTECHNOLOGY
ALUMINIUM ARSENIDES
BINDING ENERGY
EXCITONS
GALLIUM ARSENIDES
MAGNETIC FIELDS
NANOWIRES
PHOTOLUMINESCENCE
POLARIZATION
POSITIONING
QUANTUM DOTS
QUANTUM WIRES
SIGNALS
SPECTRA