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- W1997368277 abstract "We report calculations and measurements of the optical absorption coefficient of ${mathrm{Si}}_{mathit{n}}$${mathrm{Ge}}_{mathit{m}}$ superlattices and alloys where nensuremath{approxeq}m. Our results can be used to determine the fundamental band gap, the dependence of the band gap on superlattice period, and the absorption coefficient near the band-gap energy. Both theory and experiment show that all short-period (n+m20) superlattices display a similar linear dependence of absorption coefficient on photon energy. This behavior is different from alloys of the same average composition where we measure that the absorption coefficient increases with the 3/2 power of photon energy. textcopyright{} 1996 The American Physical Society." @default.
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- W1997368277 date "1996-07-15" @default.
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- W1997368277 title "Optical absorption spectroscopy of Si-Ge alloys and superlattices" @default.
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- W1997368277 doi "https://doi.org/10.1103/physrevb.54.1545" @default.
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