Keywords: user_guide

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# 2 People

The `PHonon` package was originally developed by Stefano Baroni, Stefano de Gironcoli, Andrea Dal Corso (SISSA), Paolo Giannozzi (Univ. Udine), and many others. We quote in particular:

- Michele Lazzeri (Univ.Paris VI) for the 2n+1 code and Raman cross section calculation with 2nd-order response;
- Andrea Dal Corso for the implementation of Ultrasoft, PAW, noncolinear, spin-orbit extensions to `PHonon`;
- Mitsuaki Kawamura (U.Tokyo) for implementation of the optimized tetrahedron method in phonon and electron-phonon calculations;
- Thibault Sohier, Matteo Calandra, Francesco Mauri, for phonons in two-dimensional systems;
- Andrea Floris, Iurii Timrov, Burak Himmetoglu, Nicola Marzari, Stefano de Gironcoli, and Matteo Cococcioni, for phonons using Hubbard-corrected DFPT (DFPT+U).

The `PlotPhon` and `QHA` packages were contribute by the late Prof. Eyvaz Isaev.

Other contributors include: Lorenzo Paulatto (Univ. Paris VI) for PAW, 2n+1 code; William Parker (Argonne) for phonon terms in dielectric tensor; Tobias Wassmann (Univ. Paris VI) for third-order derivatives of GGA potential. Weicheng Bao (Nanjing University) and Norge Cruz Hernandez (Universidad de Sevilla) helped debugging the phonon code.

We shall greatly appreciate if scientific work done using the QUANTUM ESPRESSO distribution will contain an acknowledgment to the following references:

> P. Giannozzi, S. Baroni, N. Bonini, M. Calandra, R. Car, C. Cavazzoni, D. Ceresoli, G. L. Chiarotti, M. Cococcioni, I. Dabo, A. Dal Corso, S. Fabris, G. Fratesi, S. de Gironcoli, R. Gebauer, U. Gerstmann, C. Gougoussis, A. Kokalj, M. Lazzeri, L. Martin-Samos, N. Marzari, F. Mauri, R. Mazzarello, S. Paolini, A. Pasquarello, L. Paulatto, C. Sbraccia, S. Scandolo, G. Sclauzero, A. P. Seitsonen, A. Smogunov, P. Umari, R. M. Wentzcovitch, J.Phys.: Condens.Matter 21, 395502 (2009)

and

> P. Giannozzi, O. Andreussi, T. Brumme, O. Bunau, M. Buongiorno Nardelli, M. Calandra, R. Car, C. Cavazzoni, D. Ceresoli, M. Cococcioni, N. Colonna, I. Carnimeo, A. Dal Corso, S. de Gironcoli, P. Delugas, R. A. DiStasio Jr, A. Ferretti, A. Floris, G. Fratesi, G. Fugallo, R. Gebauer, U. Gerstmann, F. Giustino, T. Gorni, J Jia, M. Kawamura, H.-Y. Ko, A. Kokalj, E. Küçükbenli, M .Lazzeri, M. Marsili, N. Marzari, F. Mauri, N. L. Nguyen, H.-V. Nguyen, A. Otero-de-la-Roza, L. Paulatto, S. Poncé, D. Rocca, R. Sabatini, B. Santra, M. Schlipf, A. P. Seitsonen, A. Smogunov, I. Timrov, T. Thonhauser, P. Umari, N. Vast, X. Wu, S. Baroni, J.Phys.: Condens.Matter 29, 465901 (2017)

Users of the GPU-enabled version should also cite the following paper:

> P. Giannozzi, O. Baseggio, P. Bonfà, D. Brunato, R. Car, I. Carnimeo, C. Cavazzoni, S. de Gironcoli, P. Delugas, F. Ferrari Ruffino, A. Ferretti, N. Marzari, I. Timrov, A. Urru, S. Baroni, J. Chem. Phys. 152, 154105 (2020)

Note the form QUANTUM ESPRESSO for textual citations of the code. Please also see package-specific documentation for further recommended citations. Pseudopotentials should be cited as (for instance)

> [ ] We used the pseudopotentials C.pbe-rrjkus.UPF and O.pbe-vbc.UPF from
> `http://www.quantum-espresso.org`.

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