<html>Dear community, <br />I need to calculate the electron-phonons matrix elements of a simple defect in a bulk materials.<br />I use a super cell that is large enough to study the system at gamma only:<br />- For the scf: k=gamma and k=2^3 give the same total energies (+/- 1 meV/at).<br />- For the phonons: q=gamma and q=2^3 give the same ph-DOS (after interpolations).<br /><br />However, reading the el-ph documentation and examples,<br />it is suggested that these two steps must be done on a dense k-points and q-points grids.<br /><br />Has this suggestion been done only for simple cells? (and is then not necessary for huge super cells...)<br /><br />Any comment would be apreciated,<br />Best regards,<br /><br />Antoine Jay<br /> </html>