Absorption coefficients and exciton oscillator strengths in AlGaAs-GaAs superlattices
作者： W. T. Masselink , P. J. Pearah , J. Klem , C. K. Peng , H. Morkoç
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摘要: We have experimentally determined the absolute optical-absorption coefficients and exciton oscillator strengths in AlGaAs-GaAs superlattices at liquid-helium temperatures. find that although magnitude of band-to-band absorption coefficient is essentially independent quantum-well width, due to greatly enhanced as well width becomes smaller. The energies are compared theoretical calculations shown be very good agreement. strength per unit volume proportional 1/${L}^{2}$ narrow wells. effects coupling between wells was also investigated by comparison structures with barriers 100 A\r{} those only 25 A\r{}. subband coupled decreased from their values uncoupled quantitative agreement our while decreased.
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