<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">Hi,<br><br>Have you got macroscopic dielectric constants and Born effective charges? If so, go to PlotPhon suite to see the LO-TO splitting. You can (re)calculate the dynamical matrix at the Gamma point (and then get new FC-file using q2r.x) to see the difference.<br><div> <br>Bests,<br>Eyvaz.<br></div>-------------------------------------------------------------------<br>Prof. Eyvaz Isaev, <br>Department of Physics, Chemistry, and Biology (IFM), Linkoping University, Sweden <br>Theoretical Physics Department, Moscow State Institute of Steel & Alloys, Russia, <br>isaev@ifm.liu.se, eyvaz_isaev@yahoo.com<div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: arial,helvetica,sans-serif; font-size:
13px;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> mayank gupta <mayankaditya@gmail.com><br><b><span style="font-weight: bold;">To:</span></b> pw_forum@pwscf.org<br><b><span style="font-weight: bold;">Sent:</span></b> Tue, August 31, 2010 8:42:52 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [Pw_forum] Lo-TO splliting<br></font><br>
Hi<br><br>I want to calculate the LO-To splitting for silver oxide. i used the<br>method as given in ex06. I found that at q (0.0 0.0 0.0) there are no<br>spliiting at all. I used epsil=.true. and asr='crystal' option.<br>here i am posting my output<br> diagonalizing the dynamical matrix ...<br><br> q = 0.0000 0.0000 0.0000<br> **************************************************************************<br> omega( 1) = 0.000000 [THz] = -0.000005 [cm-1]<br> ( -0.066188 0.000000 0.046752 0.000000 0.400125 0.000000 )<br> ( -0.066188 0.000000 0.046752 0.000000 0.400125 0.000000 )<br> ( -0.066188 0.000000 0.046752 0.000000 0.400125 0.000000 )<br> ( -0.066188
0.000000 0.046752 0.000000 0.400125 0.000000 )<br> ( -0.066188 0.000000 0.046752 0.000000 0.400125 0.000000 )<br> ( -0.066188 0.000000 0.046752 0.000000 0.400125 0.000000 )<br> omega( 2) = 0.000000 [THz] = -0.000002 [cm-1]<br> ( -0.367376 0.000000 0.159368 0.000000 -0.079392 0.000000 )<br> ( -0.367376 0.000000 0.159368 0.000000 -0.079392 0.000000 )<br> ( -0.367376 0.000000 0.159368 0.000000 -0.079392 0.000000 )<br> ( -0.367376 0.000000 0.159368 0.000000 -0.079392 0.000000 )<br> ( -0.367376 0.000000
0.159368 0.000000 -0.079392 0.000000 )<br> ( -0.367376 0.000000 0.159368 0.000000 -0.079392 0.000000 )<br> omega( 3) = 0.000000 [THz] = 0.000005 [cm-1]<br> ( -0.165289 0.000000 -0.372938 0.000000 0.016234 0.000000 )<br> ( -0.165289 0.000000 -0.372938 0.000000 0.016234 0.000000 )<br> ( -0.165289 0.000000 -0.372938 0.000000 0.016234 0.000000 )<br> ( -0.165289 0.000000 -0.372938 0.000000 0.016234 0.000000 )<br> ( -0.165289 0.000000 -0.372938 0.000000 0.016234 0.000000 )<br> ( -0.165289 0.000000 -0.372938
0.000000 0.016234 0.000000 )<br> omega( 4) = 1.580364 [THz] = 52.715630 [cm-1]<br> ( -0.081385 0.000000 0.118886 0.000000 -0.037502 0.000000 )<br> ( 0.448129 0.000000 -0.410628 0.000000 0.037502 0.000000 )<br> ( -0.448129 0.000000 -0.118886 0.000000 0.329243 0.000000 )<br> ( 0.081385 0.000000 0.410628 0.000000 -0.329243 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> omega( 5) = 1.580364 [THz]
= 52.715630 [cm-1]<br> ( 0.489028 0.000000 -0.175616 0.000000 -0.313412 0.000000 )<br> ( 0.100842 0.000000 0.212570 0.000000 0.313412 0.000000 )<br> ( -0.100842 0.000000 0.175616 0.000000 0.276457 0.000000 )<br> ( -0.489028 0.000000 -0.212570 0.000000 -0.276457 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> omega( 6) = 1.580364 [THz] = 52.715630 [cm-1]<br> ( -0.065026 0.000000 0.452797 0.000000
-0.387771 0.000000 )<br> ( 0.197512 0.000000 0.190259 0.000000 0.387771 0.000000 )<br> ( -0.197512 0.000000 -0.452797 0.000000 -0.255285 0.000000 )<br> ( 0.065026 0.000000 -0.190259 0.000000 0.255285 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> omega( 7) = 1.774007 [THz] = 59.174910 [cm-1]<br> ( -0.122908 0.000000 0.398604 0.000000 -0.275696 0.000000 )<br> ( 0.122908 0.000000 -0.398604 0.000000
-0.275696 0.000000 )<br> ( 0.122908 0.000000 0.398604 0.000000 0.275696 0.000000 )<br> ( -0.122908 0.000000 -0.398604 0.000000 0.275696 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> omega( 8) = 1.774007 [THz] = 59.174910 [cm-1]<br> ( -0.389307 0.000000 0.088212 0.000000 0.301095 0.000000 )<br> ( 0.389307 0.000000 -0.088212 0.000000 0.301095 0.000000 )<br> ( 0.389307 0.000000 0.088212 0.000000
-0.301095 0.000000 )<br> ( -0.389307 0.000000 -0.088212 0.000000 -0.301095 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> omega( 9) = 3.607143 [THz] = 120.322128 [cm-1]<br> ( -0.293633 0.000000 -0.292230 0.000000 0.001967 0.000000 )<br> ( 0.265922 0.000000 0.267325 0.000000 0.061289 0.000000 )<br> ( -0.262712 0.000000 0.295726 0.000000 0.032888 0.000000 )<br> ( 0.296844 0.000000 -0.263829 0.000000
0.030368 0.000000 )<br> ( -0.021659 0.000000 -0.023582 0.000000 -0.426729 0.000000 )<br> ( -0.021659 0.000000 -0.023582 0.000000 -0.426729 0.000000 )<br> omega(10) = 3.607143 [THz] = 120.322128 [cm-1]<br> ( 0.078075 0.000000 -0.269850 0.000000 -0.245149 0.000000 )<br> ( 0.053639 0.000000 -0.294286 0.000000 0.242387 0.000000 )<br> ( 0.009255 0.000000 0.262070 0.000000 -0.313969 0.000000 )<br> ( -0.015181 0.000000 0.286506 0.000000 0.311207 0.000000 )<br> ( -0.424289 0.000000 0.052484 0.000000 0.018635
0.000000 )<br> ( -0.424289 0.000000 0.052484 0.000000 0.018635 0.000000 )<br> omega(11) = 3.607143 [THz] = 120.322128 [cm-1]<br> ( 0.257143 0.000000 -0.014859 0.000000 0.313587 0.000000 )<br> ( 0.291284 0.000000 0.019282 0.000000 -0.309727 0.000000 )<br> ( -0.298890 0.000000 -0.047998 0.000000 -0.242446 0.000000 )<br> ( -0.264748 0.000000 -0.082140 0.000000 0.246306 0.000000 )<br> ( 0.051310 0.000000 0.424043 0.000000 -0.026037 0.000000 )<br> ( 0.051310 0.000000 0.424043 0.000000 -0.026037 0.000000
)<br> omega(12) = 7.073565 [THz] = 235.950289 [cm-1]<br> ( -0.288675 0.000000 -0.288675 0.000000 -0.288675 0.000000 )<br> ( 0.288675 0.000000 0.288675 0.000000 -0.288675 0.000000 )<br> ( 0.288675 0.000000 -0.288675 0.000000 0.288675 0.000000 )<br> ( -0.288675 0.000000 0.288675 0.000000 0.288675 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> omega(13) = 12.664538 [THz] = 422.446327 [cm-1]<br> ( 0.000000
0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( -0.033712 0.000000 -0.206236 0.000000 0.675522 0.000000 )<br> ( 0.033712 0.000000 0.206236 0.000000 -0.675522 0.000000 )<br> omega(14) = 12.664538 [THz] = 422.446327 [cm-1]<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000
0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( -0.340664 0.000000 0.597175 0.000000 0.165316 0.000000 )<br> ( 0.340664 0.000000 -0.597175 0.000000 -0.165316 0.000000 )<br> omega(15) = 12.664538 [THz] = 422.446327 [cm-1]<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000
0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.000000 0.000000 )<br> ( -0.618718 0.000000 -0.317566 0.000000 -0.127829 0.000000 )<br> ( 0.618718 0.000000 0.317566 0.000000 0.127829 0.000000 )<br> omega(16) = 15.504950 [THz] = 517.192894 [cm-1]<br> ( -0.042388 0.000000 -0.042388 0.000000 -0.051747 0.000000 )<br> ( 0.042388 0.000000 0.042388 0.000000 -0.051747 0.000000 )<br> ( -0.042388 0.000000 0.042388 0.000000 -0.051747 0.000000 )<br> ( 0.042388 0.000000
-0.042388 0.000000 -0.051747 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.698181 0.000000 )<br> ( 0.000000 0.000000 0.000000 0.000000 0.698181 0.000000 )<br> omega(17) = 15.504950 [THz] = 517.192894 [cm-1]<br> ( 0.050391 0.000000 0.058066 0.000000 0.048838 0.000000 )<br> ( 0.050391 0.000000 0.058066 0.000000 -0.048838 0.000000 )<br> ( -0.033209 0.000000 0.043991 0.000000 -0.034763 0.000000 )<br> ( -0.033209 0.000000 0.043991 0.000000 0.034763 0.000000 )<br> ( -0.115914 0.000000
-0.688492 0.000000 0.000000 0.000000 )<br> ( -0.115914 0.000000 -0.688492 0.000000 0.000000 0.000000 )<br> omega(18) = 15.504950 [THz] = 517.192894 [cm-1]<br> ( -0.043991 0.000000 -0.033209 0.000000 -0.034763 0.000000 )<br> ( -0.043991 0.000000 -0.033209 0.000000 0.034763 0.000000 )<br> ( -0.058066 0.000000 0.050391 0.000000 -0.048838 0.000000 )<br> ( -0.058066 0.000000 0.050391 0.000000 0.048838 0.000000 )<br> ( 0.688492 0.000000 -0.115914 0.000000 0.000000 0.000000 )<br> ( 0.688492 0.000000 -0.115914
0.000000 0.000000 0.000000 )<br> **************************************************************************<br>-- <br>Mayank kumar gupta<br>_______________________________________________<br>Pw_forum mailing list<br><a ymailto="mailto:Pw_forum@pwscf.org" href="mailto:Pw_forum@pwscf.org">Pw_forum@pwscf.org</a><br><span><a target="_blank" href="http://www.democritos.it/mailman/listinfo/pw_forum">http://www.democritos.it/mailman/listinfo/pw_forum</a></span><br></div></div>
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