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4.9 Calculation of phonon-renormalization of electron bands</A>
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The phonon-induced renormalization of electron bands can be computed using <TT>PHonon</TT>.
After SCF, PHONON, and NSCF calculations, one can run <TT>ph.x</TT> with the
<TT>electron_phonon=`ahc'</TT> option, which generates binary files containing
quantities required for the calculation of electron self-energy.
Then, a <TT>postahc.x</TT> run reads these binary files and compute the
phonon-induced electron self-energy at a given temperature.
<P>
For more details, see the <code>PHonon/Doc/dfpt_self_energy.pdf</code> file.
<P>
Also, there is an example in <code>PHonon/example/example19/</code>.
<P>
Implementation of this functionality in Q<SMALL>UANTUM </SMALL>ESPRESSO is described in the following
paper:
<P>
J.-M. Lihm and C.-H. Park, Phys. Rev. B <B>101</B>, 121102 (2020).
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