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Schrodinger in a weak periodic potential

  1. Sep 23, 2014 #1
    i8uyZ2b.jpg

    Hi,

    I have problems figuring out what both c-coefficients means.

    Can someone explain this in a conceptual way?

    Also, Vg and V-g are the coefficients of the Fourier series if you expand V, but what does it mean physically?

    Thanks in advance.
     
  2. jcsd
  3. Sep 23, 2014 #2
    Vg is just the amplitude of your periodic potential, isn't it? :)

    (my god)

    And V-g, the amplitude of periodic potential in the next Brillouin Zone?
     
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