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Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells.

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Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells.

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Title: Enhancement of exciton binding energies in ZnO/ZnMgO multi-quantum wells.
Author: Makino, T.; Segawa, Y.; Kawasaki, M.; Ohtomo, A.; Tamura, K.; Koinuma, H.; Sun, Handong.
Copyright year: 2002
Abstract: The effect of confinement on the exciton binding energies has been systematically investigated for two series of ZnO/ZnMgO multiquantum wells with various well widths and barrier heights. The exciton binding energies were extracted from the energy difference between the stimulated emission band induced by inelastic exciton–exciton scattering and the free exciton absorption band. The binding energies of excitons are found to be sensitively dependent on the well widths. The experimental results of the well width dependence of binding energies are in good agreement with Coli and Bajaj’s theoretical calculations for these structures [G. Coli and K. K. Bajaj, Appl. Phys. Lett. 78, 2861 (2001)]. The remarkable reduction in coupling strength between excitons and longitudinal optical phonons is closely correlated with the enhancement of the exciton binding energy, indicating that the stability of excitons is greatly increased by the enhancement of exciton binding energy in quantum wells.
Subject: DRNTU::Science::Physics::Optics and light.
Type: Journal Article
Series/ Journal Title: Journal of applied physics
School: School of Physical and Mathematical Sciences
Rights: Journal of Applied Physics © 2002 American Institute of Physics. The journal's website is located at http://jap.aip.org/.
Version: Published version

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