<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body><div dir="auto">The static dielectric matrix is computed by the phonon (ph.x) code, with option epsil=.true., you can set trans=.false. if you want to avoid computing also the phonons.<br><br>The epsil.x code computes the dynamical dielectric matrix (with a sum over empty states if I remember correctly). It should match the other in the low energy limit.<br><br>Hth</div><br><br><div class="gmail_quote"><div dir="auto">On June 2, 2023 10:01:45 p.m. GMT+02:00, "Филанович Антон" <a.n.filanovich@yandex.ru> wrote:</div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div> </div><div><span style="color:#222222;font-family:'arial' , 'helvetica' , sans-serif;font-size:small;white-space:normal">Dear community,</span></div><div><div style="background-color:rgb( 255 , 255 , 255 );color:rgb( 34 , 34 , 34 );font-family:'arial' , 'helvetica' , sans-serif;font-size:small;font-style:normal;font-weight:400;text-decoration-color:initial;text-decoration-style:initial;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">I need to calculate electronic and ionic contribution to the static dielectric tensor - similar to what is done in VASP as described here <a href="https://www.vasp.at/wiki/index.php/LEPSILON" rel="noopener noreferrer" target="_blank" style="color:rgb( 17 , 85 , 204 )">https://www.vasp.at/wiki/index.php/LEPSILON</a> . Do I understand correctly that in epsr.dat file, which we obtain after a calculation with epsilon.x, three values at zero frequency correspond to the diagonal elements of the static dielectric tensor? However, even if is true, how can I obtain electronic/ionic contributions?</div><div style="background-color:rgb( 255 , 255 , 255 );color:rgb( 34 , 34 , 34 );font-family:'arial' , 'helvetica' , sans-serif;font-size:small;font-style:normal;font-weight:400;text-decoration-color:initial;text-decoration-style:initial;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"> </div><div style="background-color:rgb( 255 , 255 , 255 );color:rgb( 34 , 34 , 34 );font-family:'arial' , 'helvetica' , sans-serif;font-size:small;font-style:normal;font-weight:400;text-decoration-color:initial;text-decoration-style:initial;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Thanks in advance,</div><div style="background-color:rgb( 255 , 255 , 255 );color:rgb( 34 , 34 , 34 );font-family:'arial' , 'helvetica' , sans-serif;font-size:small;font-style:normal;font-weight:400;text-decoration-color:initial;text-decoration-style:initial;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px">Anton</div></div></blockquote></div></body></html>