Keywords: user_guide

Next: 5 Parallelism Up: 4 Using PHonon Previous: 4.8 Fourier interpolation of Contents

## 4.9 Calculation of phonon-renormalization of electron bands

The phonon-induced renormalization of electron bands can be computed using `PHonon`. After SCF, PHONON, and NSCF calculations, one can run `ph.x` with the `electron_phonon=`ahc'` option, which generates binary files containing quantities required for the calculation of electron self-energy. Then, a `postahc.x` run reads these binary files and compute the phonon-induced electron self-energy at a given temperature.

For more details, see the `PHonon/Doc/dfpt_self_energy.pdf` file.

Also, there is an example in `PHonon/example/example19/`.

Implementation of this functionality in QUANTUM ESPRESSO is described in the following paper:

J.-M. Lihm and C.-H. Park, Phys. Rev. B 101, 121102 (2020).