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  4. Large size dependence of exciton-longitudinal-optical-phonon coupling in nitride-based quantum wells and quantum boxes
 
research article

Large size dependence of exciton-longitudinal-optical-phonon coupling in nitride-based quantum wells and quantum boxes

Kalliakos, S.
•
Zhang, X. B.
•
Taliercio, T.
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2002
Applied Physics Letters

We present an experimental and theoretical study of the size dependence of the coupling between electron-hole pairs and longitudinal-optical phonons in Ga1-xInxN/GaN-based quantum wells and quantum boxes. We found that the Huang-Rhys factor S, which determines the distribution of luminescence intensities between the phonon replicas and the zero-phonon peak, increases significantly when the vertical size of the boxes or the thickness of quantum well increases. We assign this variation to (1) the strong electric field present along the growth axis of the system, due to spontaneous and piezoelectric polarizations in these wurtzite materials, and (2) the localization on separate sites of electrons and holes in the plane of the wells or boxes, due to potential fluctuations in the ternary alloy. Indeed, envelope-function calculations for free or localized excitons, with electron-hole distance only controlled by Coulomb interaction, do not account quantitatively for the measured behavior of the S factor. In fact, the latter is rather similar to what is obtained for donor-acceptor pairs, with a statistical distribution of distances between localization centers for electrons and holes. (C) 2002 American Institute of Physics.

  • Details
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Type
research article
DOI
10.1063/1.1433165
Author(s)
Kalliakos, S.
Zhang, X. B.
Taliercio, T.
Lefebvre, P.
Gil, B.
Grandjean, N.  
Damilano, B.
Massies, J.
Date Issued

2002

Published in
Applied Physics Letters
Volume

80

Issue

3

Start page

428

End page

430

Subjects

PHOTOLUMINESCENCE

•

INGAN/GAN

•

GAN

Editorial or Peer reviewed

REVIEWED

Written at

OTHER

EPFL units
LASPE  
Available on Infoscience
October 5, 2010
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/54975
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