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Homework Help: Tight binding (FCC structures)

  1. Sep 22, 2008 #1
    I'm reading my lectures on TBM and I don't understand the following thing:

    [tex]\omega(\overrightarrow k)=\omega_0-4t\cdot[\cos(k_xa/2)\cos(k_ya/2)+...][/tex]

    It's related to FCC structures, in which the number of Nearest Neighbors [tex](Z)[/tex] of an atom is equal to 12. Basically the three dots at the end leave me puzzled. What are they supposed to mean? Any help appreciated.
     
  2. jcsd
  3. Sep 22, 2008 #2
    I guess just the cyclic permutation of (k_x, k_y, k_z)
     
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