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Valence electrons in insulators

  1. Oct 22, 2013 #1
    I was wondering why the valence electrons aren't free to move in insulators? Thanks for any help in advance.
  2. jcsd
  3. Oct 22, 2013 #2


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  4. Oct 22, 2013 #3


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  5. Oct 30, 2013 #4
    In fact they move with their group velocities but since the band is full, movement of the electron at k would neutralize the movement of another one at -k.
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