[Pw_forum] problem in plot bandstructure

[Mahdi Faqieh nasiri]

Dear all,
i am trying to plot bandstructure, but i have a problem.
as you see in picture attached, conduction band that follow red line, cross with valence band (green line) and in continuance it form valence band and valence band form conduction band that it's not possible in real bandstructure, what is wrong?
what should i do?


 
Mahdi Faghih nasiri
MSC,
Guilan University,
Rasht, Iran.
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