Solution LAB1 Al

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What we can note is:

• Larger k-points grids are needed with respect the insulator case
• Notice that you cannot reduce the broadening too much: the energy levels must have some overlap, or else the advantage of broadening is lost. A small broadening is needed, but it can be reduced only if the k point grid is dense enough
• Note that the number of bands (Kohn-Sham states) is no longer automatically set to the number of electrons divided by 2, but a larger number of bands is considered.
• Note also that for metallic system the Fermi energy is reported in the output