Identification of electric dipole moments of excitonic complexes in nitride-based quantum dots

The built-in dipole moments of excitonic and multiexcitonic complexes of GaN/AlN quantum dots (charged and uncharged excitons and biexcitons) are investigated in detail, both experimentally and theoretically. The calculations are done with Hartree-Fock wave functions in the framework of an 8-band k...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2013-07, Vol.88 (4), Article 045309
Main Authors: Hönig, Gerald, Rodt, Sven, Callsen, Gordon, Ostapenko, Irina A., Kure, Thomas, Schliwa, Andrei, Kindel, Christian, Bimberg, Dieter, Hoffmann, Axel, Kako, Satoshi, Arakawa, Yasuhiko
Format: Article
Language:English
Subjects:
Charging
Condensed matter
Dipole moment
Electric dipoles
Electric fields
Excitation
Mathematical analysis
Quantum dots
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Summary:The built-in dipole moments of excitonic and multiexcitonic complexes of GaN/AlN quantum dots (charged and uncharged excitons and biexcitons) are investigated in detail, both experimentally and theoretically. The calculations are done with Hartree-Fock wave functions in the framework of an 8-band k times p approximation. Electric dipole moments of different excitonic complexes are found to vary significantly. Hence, their Coulomb coupling to charged defects in the vicinity of a QD produces emission energy variations, known as spectral diffusion, which can be used to identify the emitting excitonic complex. This method was exemplary applied to the presented cathodoluminescence and mu -photoluminescence data and opens a way to identify excitonic complexes by their response to external electric fields.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.88.045309