[Pw_forum] a question about nbnd setting in band structure calculation

[Peter Winey]

Dear all,

I had a little trouble with band calculation for a metallic material, so I
revisited example01.

When I run the "bands" calculation for Al, I found that the results depend
on the setting
of "nbnd". I tried nbnd=8 (the value used in the example) and nbnd=10. The
bands below
the Fermi level are the same in both cases, however, some of the empty bands
are clearly
different.

I am puzzled by this. Is there any physics that I missed?

-Peter
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