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 1,912
    Science Advisor
    Gold Member

  4. DrDu

    DrDu 4,639
    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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