Silicon band structure for both ibrav 0 and ibrav 2

[Falaye75]

Silicon Band Structure for both ibrav 0 and ibrav 2
I did scf and bands for silicon using both ibrav=0 and ibrav 2
After running the two bands separately I noticed that the band structures for the two (ibrav 0 and ibrav 2) were totally difference but in literature i read that the two (both ibrav 0 and ibrav 2) should give the same result. For Ibrav 2 band structure gave correct stucture while ibrav 0 gave wrong structure. Please what should i do to ensure that the two band structures are the same. Thanks in anticipation

 

[TeethWhitener]

Please what should i do

First, you should ensure that you provide enough info that someone reading the question would know what you're talking about. I'm assuming you're referring to a band structure calculation using Quantum Espresso, where "ibrav" refers to an index for the Bravais lattice. For ibrav=0, the Bravais lattice is left unspecified and you have to input all lattice parameters by hand. For ibrav=2, the Bravais lattice is constrained to be face centered cubic and all you have to input is the unique lattice parameter that defines fcc crystal structure. Ref here:
https://www.quantum-espresso.org/Doc/INPUT_PW.html#idm45922794627520
This paragraph is a reference for other PF users who might know how to answer your question but don't use QE specifically.

Dumb question: are you ensuring that the crystal you're calculating is identical for ibrav 0 and ibrav 2?