Valence electrons in insulators

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

    UltrafastPED 1,918
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  4. DrDu

    DrDu 4,277
    Science Advisor

  5. 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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