Posted by Steve Simon on April 7, 2013, 10:53 pm, in reply to "Energies in 1st Brillouin zone of 2D square lattice "
From which formula are you getting the wrong mass? From (hbar^2 / (2 m))( 2 pi^2/a^2) = 7.96 eV I get the right electron mass (to within a few percent).
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