期刊
APPLIED PHYSICS LETTERS
卷 80, 期 16, 页码 2860-2862出版社
AMER INST PHYSICS
DOI: 10.1063/1.1471374
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Photoreflectance spectra of a high-quality ZnO epilayer on the ScAlMgO4 (0001) substrate grown by laser molecular-beam epitaxy exhibited clear excitonic resonances due to three excitons associated with uppermost valence bands (A, B, and C excitons). The oscillator strengths of the B and C excitons are larger than that of the A exciton. Their broadening was interpreted to be due to the contribution by exciton-polaritons in terms of large longitudinal-transverse splitting of respective excitons. Dependence of the exciton energy on temperature was well fitted assuming the Bose-Einstein statistics giving the Einstein characteristic temperature Theta(E) of 380 K (33 meV). (C) 2002 American Institute of Physics.
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