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<input_description distribution="Quantum Espresso" package="PWscf" program="postahc.x" >
   <toc>
   </toc>
   <intro>
<b>Purpose of postahc.x:</b>

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

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

    <b>Structure of the input data:</b>
========================================================================

<b>&amp;INPUT</b>
   ...specs of namelist variables...
<b>/</b>
   </intro>
   <namelist name="INPUT" >
      <var name="ahc_dir" type="CHARACTER" >
         <status> REQUIRED
         </status>
         <info>
Directory where the binary files are located.
         </info>
      </var>
      <var name="nk" type="INTEGER" >
         <status> REQUIRED
         </status>
         <info>
Number of k points. Must be identical to that of the preceding SCF or NSCF run.
         </info>
      </var>
      <var name="nbnd" type="INTEGER" >
         <status> REQUIRED
         </status>
         <info>
Number of bands. Must be identical to nbnd of the preceding SCF or NSCF run.
         </info>
      </var>
      <var name="nat" type="INTEGER" >
         <status> REQUIRED
         </status>
         <info>
Number of atoms. Must be identical to nat of the preceding pw.x and ph.x
runs.
         </info>
      </var>
      <var name="nq" type="INTEGER" >
         <status> REQUIRED
         </status>
         <info>
Number of q points. Must be identical to that of the preceding ph.x run
with electron_phonon=&apos;ahc&apos;.
         </info>
      </var>
      <var name="ahc_nbnd" type="INTEGER" >
         <status> REQUIRED
         </status>
         <info>
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=&apos;ahc&apos;.
         </info>
      </var>
      <var name="ahc_nbndskip" type="INTEGER" >
         <default> 0
         </default>
         <info>
Number of bands to exclude when computing the self-energy. Must be identical to
ahc_nbndskip of the ph.x run with electron_phonon=&apos;ahc&apos;.
         </info>
      </var>
      <var name="flvec" type="CHARACTER" >
         <status> REQUIRED
         </status>
         <info>
File containing the normalized phonon displacements written by matdyn.x.
         </info>
      </var>
      <var name="eta" type="REAL" >
         <status> REQUIRED
         </status>
         <info>
Magnitude of the small imaginary component included to smooth the energy
denominators, in Ry.
         </info>
      </var>
      <var name="temp_kelvin" type="REAL" >
         <status> REQUIRED
         </status>
         <info>
Temperature in Kelvins at which the electron self-energy is calculated.
         </info>
      </var>
      <var name="efermi" type="REAL" >
         <status> REQUIRED
         </status>
         <info>
Fermi energy of the electrons in Ry.
         </info>
      </var>
      <dimension name="amass_amu" start="1" end="nat" type="REAL" >
         <status> REQUIRED
         </status>
         <info>
Mass for each atom in atomic mass unit. In postahc.x, <ref>amass_amu</ref> must be
set for each atom, not for each atom type as in other programs.
         </info>
      </dimension>
      <var name="skip_upperfan" type="LOGICAL" >
         <default> .false.
         </default>
         <info>
If .true., skip calculation of the upper Fan self-energy.
If .false., ahc_upfan_iq#.bin files must be present in <ref>ahc_dir</ref>.
         </info>
      </var>
      <var name="skip_dw" type="LOGICAL" >
         <default> .false.
         </default>
         <info>
If .true., skip calculation of the Debye-Waller self-energy.
If .false., ahc_dw.bin file must be present in <ref>ahc_dir</ref>.
         </info>
      </var>
   </namelist>
</input_description>
