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Homework Help: Difference between phonon and electron excitation

  1. Apr 13, 2015 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    Debye approximation.

    3. The attempt at a solution
    For the first question (a) he has taken the lowest energy transition to be 0.2eV. (3eV-2.8eV with k=0)
    For the second question (b) he has taken the lowest energy transition to be at k=1. (it works out as 0.15eV)

    I understand why it's taken at k=1 for the electron but why is the lowest energy transition taken at k=0 for the first question?

    Thanks for any help clearing this up.
  2. jcsd
  3. Apr 18, 2015 #2
    Thanks for the post! This is an automated courtesy bump. Sorry you aren't generating responses at the moment. Do you have any further information, come to any new conclusions or is it possible to reword the post?
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