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Exciton acoustic–phonon coupling in single In 0.4 Ga 0.6 As/GaAs quantum rings
Author(s) -
Triki M.,
Jaziri S.
Publication year - 2017
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201600833
Subject(s) - phonon , exciton , condensed matter physics , coupling (piping) , sideband , piezoelectricity , physics , line (geometry) , deformation (meteorology) , spectral line , materials science , quantum mechanics , geometry , mathematics , microwave , meteorology , acoustics , metallurgy
Coupling of acoustic phonons to excitons in small In 0.4 Ga 0.6 As/GaAs quantum rings (QRs) is investigated. The temperature dependence on the spectral distribution of the excitonic single QR luminescence is presented and discussed. The contributions of piezoelectric and deformation potential couplings are specified. We find that QR spectra exhibit non‐Lorentzian line shapes including sharp zero‐phonon lines with broad backgrounds induced by acoustic phonons couplings. The latter are strongly temperature dependent. Coupling via the deformation potential mechanism is found to have the dominant contribution. This involves more energetic phonons and leads to sideband broadenings. Phonons that contribute to piezoelectric coupling have low energies. Their impact is in close proximity to the zero‐phonon line (ZPL) peak.