Purpose of postahc.x:

- Read the electron-phonon quantities calculated by ph.x with the electron_phonon='ahc' option.

- Calculate the phonon-induced electron self-energy in the full matrix form at a given temperature.

Structure of the input data: ========================================================================

&INPUT ...specs of namelist variables... /
REQUIRED
Directory where the binary files are located.
REQUIRED
Number of k points. Must be identical to that of the preceding SCF or NSCF run.
REQUIRED
Number of bands. Must be identical to nbnd of the preceding SCF or NSCF run.
REQUIRED
Number of atoms. Must be identical to nat of the preceding pw.x and ph.x runs.
REQUIRED
Number of q points. Must be identical to that of the preceding ph.x run with electron_phonon='ahc'.
REQUIRED
Number of bands for which the electron self-energy is to be computed. Must be identical to ahc_nbnd of the ph.x run with electron_phonon='ahc'.
0
Number of bands to exclude when computing the self-energy. Must be identical to ahc_nbndskip of the ph.x run with electron_phonon='ahc'.
REQUIRED
File containing the normalized phonon displacements written by matdyn.x.
REQUIRED
Magnitude of the small imaginary component included to smooth the energy denominators, in Ry.
REQUIRED
Temperature in Kelvins at which the electron self-energy is calculated.
REQUIRED
Fermi energy of the electrons in Ry.
REQUIRED
Mass for each atom in atomic mass unit. In postahc.x, amass_amu must be set for each atom, not for each atom type as in other programs.
.false.
If .true., skip calculation of the upper Fan self-energy. If .false., ahc_upfan_iq#.bin files must be present in ahc_dir.
.false.
If .true., skip calculation of the Debye-Waller self-energy. If .false., ahc_dw.bin file must be present in ahc_dir.