Dear Paolo thank's for your answer. it helps
On Sun, Jan 12, 2014 at 3:03 PM, Paolo Giannozzi <paolo.giannozzi at uniud.it>wrote: > On Sun, 2014-01-12 at 13:55 +0330, shiva mokhavat wrote: > > > I want to calculate phonon properties of cinnabar hexagonal structure > > of HgTe, but when I run ph.x some of the frequencies are negative. why > > this happen? > > See http://www.quantum-espresso.org/faq/phonons/ , in particular > items 7.3 and 7.2 > > P. > -- > Paolo Giannozzi, Dept. Chemistry&Physics&Environment, > Univ. Udine, via delle Scienze 208, 33100 Udine, Italy > Phone +39-0432-558216, fax +39-0432-558222 > > _______________________________________________ > Pw_forum mailing list > Pw_forum at pwscf.org > http://pwscf.org/mailman/listinfo/pw_forum > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://pwscf.org/pipermail/pw_forum/attachments/20140117/e199a6f8/attachment.html
