[QE-developers] Phase of wave-function

[Duy Le]

Dear developers,

After reading many threads about the subject, and lot of testing, I still
not very confident in handling the phases of wave functions. I would
appreciate if you could help me with the following:

1. Do all wave-functions (of all bands) of a given k-point have the same
phase? In other words, is psi(k, ib1) psi(k, ib2)* gauge invariant?
2. I want also to calculate  psi(k, ib1) psi(k2, ib2)*. How should it be
done so the random phases of wfc do not affect the result?
3. Could you please tell me if there is any part of the PWSCF code that
deals with phase of wave function so I can learn how it is done?

Thank you very much. Be safe!

Duy Le
University of Central Florida
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