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Effects of Strain Fields on Excitons and Phonons in Wurtzite GaN Epilayers

Published online by Cambridge University Press:  10 February 2011

B. Gil ,
O. Briot ,
R. L. Aulombard ,
J. F. Demangeot ,
J. Frandon  and
M. Renucci
B. Gil
Affiliation:
CNRS - GES, Université de Montpellier II -Case Courrier 074, 34095 Montpellier - Francegil@ges. univ-montp2. fr
O. Briot
Affiliation:
CNRS - GES, Université de Montpellier II -Case Courrier 074, 34095 Montpellier - Francegil@ges. univ-montp2. fr
R. L. Aulombard
Affiliation:
CNRS - GES, Université de Montpellier II -Case Courrier 074, 34095 Montpellier - Francegil@ges. univ-montp2. fr
J. F. Demangeot
Affiliation:
Laboratoire de Physique des Solides - Université Paul Sabatier, 31062 Toulouse Franwce
J. Frandon
Affiliation:
Laboratoire de Physique des Solides - Université Paul Sabatier, 31062 Toulouse Franwce
M. Renucci
Affiliation:
Laboratoire de Physique des Solides - Université Paul Sabatier, 31062 Toulouse Franwce
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Abstract

The electronic structure of a set of several tens of a few micrometer-thick GaN epilayers grown by MOVPE on (000l)-oriented sapphire is investigated by means of photoluminescence and reflectance spectroscopy. The strain-fields effects are quantitatively interpreted using a group theory analysis which predicts seven pertinent parameters: the crystal field splitting, two spin-orbit interaction parameters and four deformation potentials. From a theoretical point of view, we also examine the exciton problem. We establish the selection rules which control the strength of optical transitions for Г5 and Г1 excitons, and estimate the electron hole exchange interaction and the longitudinal transverse splitting of A, B, C excitons. Raman spectroscopy measurements are performed at various temperatures to observe the strain-induced shift of Raman frequencies. We determine four phonon deformation potentials in w-GaN.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 449: Symposium N – III-V Nitrides , 1996 , 745
Copyright
Copyright © Materials Research Society 1997

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References

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