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Homework Help: Effective mass

  1. Feb 8, 2010 #1
    1. The problem statement, all variables and given/known data
    What is the effective mass of the electron at the bottom of the band and at the corner of the Brillouin Zone? What is the significance of these results? Atoms lie on a square lattice of side a.

    2. Relevant equations

    E(kx,ky) = C{1 - cos(kxa) - cos(ky)}

    3. The attempt at a solution

    I don't really understand how to use the effective mass tensor to get the result I need, can I somehow use the fact that the areas where I need to know the effective mass have high symmetry, e.g. the contours of constant energy are circular.....
  2. jcsd
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