[Wien] Fermi level

[tarek.ben-nasr at laposte.net]

Dear Wien users, 
I have searched in the archives to understand why the fermi level is at the maximum of the valence band in band structure plot of a semiconductor, I found that it was an arbitrary choice but untill now i can't explain this from a physical point of view since for me the fermi level must be in the middle of the gap. 

Thank you for your help 
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