How to set parameter about doping concentration in epw.in file?

[Nacy Cui]

Dear all,

Hi, I'm a beginner of EPW package. I want to calculate the electron-phonon coupling under charge doping, but i didn't know how to control the concentration of doped electrons or holes in the epw.in file? In other words, is there any parameter similar to the "tot_charge" in the scf.in file?

Best wishes,
Nacy Cui