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Homework Help: Overlap of energy bands

  1. Jun 16, 2007 #1
    1. The problem statement, all variables and given/known data
    I'm using http://ece-www.colorado.edu/~bart/book/" [Broken] to understand my course on semiconductor physics better. In paragraph 2.3.4, the difference between insulators, semiconductors, metals is explained, based on the differences in bands. I understand the basic model.

    What I don't understand, is figure 2.3.7 b) : fig2_3_7.gif

    How should I visualize this? Which bands are overlapping? Are these two valence bands overlapping? (As is the case in most semiconductors) Or is this the overlapping of a valence band and a conduction band - hence, is there no bandgap then? Is this the behaviour of a metal?

    Many thanks already,


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    Last edited by a moderator: May 2, 2017
  2. jcsd
  3. Jun 16, 2007 #2


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    I think it is the valence band that overlaps the conducting band, of the entire solid of course. These "bands" are for the solid as a whole, not for individual atoms.
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