Strong dipole coupling in nonpolar nitride quantum dots due to Coulomb effects
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Date
2012
Authors
Schuh, K.
Barthel, S.
Marquardt, Oliver
Hickel, Tilmann
Neugebauer, J.
Czycholl, G.
Jahnke, F.
Journal Title
Journal ISSN
Volume Title
Publisher
AIP Publishing
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Abstract
Optical properties of polar and nonpolar nitride quantum dots (QDs) are determined on the basis of a microscopic theory which combines a continuum elasticity approach to the polarization potential, a tight-binding model for the electronic energies and wavefunctions, and a many-body theory for the optical properties. For nonpolar nitride quantum dots, we find that optical absorption and emission spectra exhibit a weak ground-state oscillator strength in a single-particle calculation whereas the Coulomb configuration interaction strongly enhances the ground-state transitions. This finding sheds new light on existing discrepancies between previous theoretical and experimental results for these systems, as a weak ground state transition was predicted because of the spatial separation of the corresponding electron and hole state due to intrinsic fields whereas experimentally fast optical transitions have been observed. (C) 2012 American Institute of Physics. (http://dx.doi.org/10.1063/1.3688900)
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Keywords
Quantum dots , Ground states , Spatial dimensions , Polarization , Optical properties
Citation
Schuh, K., Barthel, S., Marquardt, O., Hickel, T., Neugebauer, J., Czycholl, G. and Jahnke, F. (2012) 'Strong dipole coupling in nonpolar nitride quantum dots due to Coulomb effects', Applied Physics Letters, 100(9), pp. 092103. doi: 10.1063/1.3688900
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Copyright
© 2012 American Institute of Physics.This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in Schuh, K., Barthel, S., Marquardt, O., Hickel, T., Neugebauer, J., Czycholl, G. and Jahnke, F. (2012) 'Strong dipole coupling in nonpolar nitride quantum dots due to Coulomb effects', Applied Physics Letters, 100(9), pp. 092103 and may be found at http://aip.scitation.org/doi/abs/10.1063/1.3688900