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Homework Help: Matthiessen's rule, relating it to applied electric field

  1. Apr 6, 2015 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations

    3. The attempt at a solution
    I understand the basic concept of Matthiessen's rule that the contribution to electronic resistivity / conductivity is split into two independant componants, resistivity due to impurities and resistivity due to the lattice. But I am unsure how this relates to if an electric field is applied. Also we have been taught it only applies if independant from the wavevector, could someone perhaps emphasise this a little?

    Please could someone give me a point in the right direction.
  2. jcsd
  3. Apr 7, 2015 #2

    The only thing I can think is that if the resistivity is proportional to the electric field then it somehow changes the wavevector so it cannot be used.
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