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I Phonon energy in absorption of indirect band gap

  1. Oct 18, 2016 #1
    Does phonon required a minimum energy in the absorption process of an indirect band gap, and why?
  2. jcsd
  3. Oct 18, 2016 #2

    Andy Resnick

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    The conservation equations for momentum and energy must both be satisfied; your answer lies within those.
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