EPW Forum

Dear developers/users,
I am studying the Fermi surface at low and high temperature renormalized by electron-phonon interactions.
From the tutorial, I find that EPW code compute the Fan-Migdal selfenergy, while the Debye-Waller selfenergy is approximately included by using a sum rule to conserve the electron number. I am wandering, does this approximation fix the Fermi surface, so that the Fermi surface would not change at different temperatures?

Best
Fawei

Dear Fawei,

This does not fix the Fermi surface. We simply made a constrain at the Fermi level (wherever it is).

Best,
Samuel

Dear Samuel,
That's great, so that I can use the EPW code in Fermi surface study. Thanks for your kind reply!
Best,
Fawei