Now I am studying k.p theory based on FD method to calculate the energy band structure of semiconductor, but I find that the number of discrete points (dz) has a great influence on the output result, and the smaller the dz is, the worse the result will be. Has anyone made a similar conclusion?The smaller the value of dz, the better, or to take the appropriate value, according to the theory of the smaller should not be more accurate?

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