Dear P. B. Sorokin: > But when I try to evaluate the velocity I obtain the answer nearly in > six time less then reported early: 2200 m/s and 3400 m/s vs. 12200 > m/s and 19500 m/s. > I do some stupid mistake, but where? Does anybody has the experience > in such calculations? Where does your reference for the sound velocity come from? And there are 3 acoustic bands for graphene, one of which is the bending mode with a parabolic dispersion near gamma point. Have you pay attention to this band? Best Wishes! Yours Sincerely L.F.Huang
------ ====================================================================== L.F.Huang(???) DFT and phonon physics ====================================================================== Add: Research Laboratory for Computational Materials Sciences, Instutue of Solid State Physics,the Chinese Academy of Sciences, P.O.Box 1129, Hefei 230031, P.R.China Tel: 86-551-5591464-328(office) Fax: 86-551-5591434 Web: http://theory.issp.ac.cn (website of our theory group) http://www.issp.ac.cn (website of our institute) ====================================================================== -------------- next part -------------- An HTML attachment was scrubbed... URL: http://www.democritos.it/pipermail/pw_forum/attachments/20100325/c4851a01/attachment.htm
