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- W2037477595 abstract "The expressions for absorption and luminescence linewidths of Wannier excitons in short-period superlattices are derived for several scattering mechanisms. The wave function of the 1s excitons is assumed to be a product of (i) a variational function describing relative motion of electrons and holes, and (ii) the envelope functions for the electrons and holes obtained from the Kronig-Penney model. The scattering rates are calculated by using Fermi's golden rule for deformation potential, interface roughness, and alloy-disorder scattering. The linewidth due to interface-roughness scattering is also expressed by employing the self-consistent Born approximation. Numerical values presented for GaAs/${mathrm{Al}}_{0.3}$${mathrm{Ga}}_{0.7}$As superlattices indicate that the deformation-potential scattering is weak and that the alloy-disorder scattering is significant for lower values of the superlattice period. The most significant contribution to the linewidth comes from the interface-roughness scattering; the golden rule yields quite large values, whereas reasonable values are obtained from the self-consistent Born approximation." @default.
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- W2037477595 date "1992-11-15" @default.
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- W2037477595 title "Low-temperature exciton linewidth in short-period superlattices" @default.
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- W2037477595 doi "https://doi.org/10.1103/physrevb.46.13268" @default.
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