Dear Bipul Rakshit:<div>As long as you can get the "effectiv charge" of AFM insulator, you can get the LO-TO splitting.</div><div>However, I think it is difficult to deal with the "effective charge" of AFM insulator.</div>

<div><br></div><div>Maybe this could give you some help:)</div><div><a href="http://www.democritos.it/pipermail/pw_forum/2011-January/019131.html">http://www.democritos.it/pipermail/pw_forum/2011-January/019131.html</a><br>

<br><div class="gmail_quote">On Fri, May 27, 2011 at 11:13 AM, Bipul Rakshit <span dir="ltr"><<a href="mailto:bipulrr@gmail.com">bipulrr@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">

Dear PWSCF users,<br>
is it possible/implemented in PWSCF to get lo-to splitting in case of<br>
anti-ferro magnetic insulator compounds?<br>
thx<br>
<br>
--<br>
Bipul Rakshit<br>
Research Associate,<br>
S N Bose Centre for Basic Sciences,<br>
Salt Lake,<br>
Kolkata 700 098<br>
India<br>
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</blockquote></div><br><br clear="all"><br>-- <br>____________________________________<br>Hui Wang<br>School of physics, Fudan University, Shanghai, China<br>
</div>