EPW Forum

Dear all

I have a simple question about the electron-phonon coupling at Gamma point.
In inhomogeneous systems, for example layered materials, the phonon frequencies and
the electron-phonon coupling at Gamma depend from the direction where they are calculated.

How this direction is decided in EPW?

best
Claudio Attaccalite

Dear Claudio,

Sorry for the very late reply.

Exactly at \Gamma, its not decided. The code returns the value of \omega and g without the non-analytical part (exactly what you get from a direct DFPT calculation at \Gamma).

For info, the tolerance on "exactly \Gamma" is 1E-8 in crystal unit.

Hope this helps,
Best,
Samuel