<div style="line-height:1.7;color:#000000;font-size:14px;font-family:arial">Dear Prof. Giannozzi:<br>Thank you very much for your attention on my question.<br>I still have a problem about graphite phonon. I saw a lot of persons calculated that, including prof. Marzari. However, all of their calculations were based on xy-plane,<span style="font-style: italic;"> i.e.</span>, Gamma-M-K-Gamma q-path, even one of papers mentioned about calculating IFC through nk1*nk2, 2-dimensional MP grid.<br>Therefore, I am wondering that, if I calculate IFC in 2D, does QHA work on this 2D-IFC?<br><br><div>--<br>GAO Zhe<br>CMC Lab, MSE, SNU, Seoul, S.Korea<br>        
</div><div id="divNeteaseMailCard"></div><br><pre><br>在&nbsp;2011-10-10&nbsp;14:30:52，"Paolo&nbsp;Giannozzi"&nbsp;&lt;giannozz@democritos.it&gt;&nbsp;写道：
&gt;
&gt;On&nbsp;Oct&nbsp;10,&nbsp;2011,&nbsp;at&nbsp;20:11&nbsp;,&nbsp;Éric&nbsp;Germaneau&nbsp;wrote:
&gt;
&gt;&gt;&nbsp;Also&nbsp;usually&nbsp;people&nbsp;&nbsp;use&nbsp;a&nbsp;&nbsp;supercell&nbsp;to&nbsp;compute&nbsp;phonon.
&gt;
&gt;people&nbsp;using&nbsp;linear&nbsp;response&nbsp;do&nbsp;not&nbsp;need&nbsp;any&nbsp;supercell
&gt;
&gt;P.
&gt;---
&gt;Paolo&nbsp;Giannozzi,&nbsp;Dept&nbsp;of&nbsp;Chemistry&amp;Physics&amp;Environment,
&gt;Univ.&nbsp;Udine,&nbsp;via&nbsp;delle&nbsp;Scienze&nbsp;208,&nbsp;33100&nbsp;Udine,&nbsp;Italy
&gt;Phone&nbsp;+39-0432-558216,&nbsp;fax&nbsp;+39-0432-558222
&gt;
&gt;
&gt;
&gt;
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