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what is your system ?<br>
born effective charges are not necessarily hermitian although very
often they are.<br>
stefano<br>
<br>
On 04/07/2011 09:28 AM, mohaddeseh abbasnejad wrote:
<blockquote
cite="mid:BANLkTinmWP4NNYojbPpTh5zjRRC5HmsAFA@mail.gmail.com"
type="cite">
<pre wrap="">Dear all,
Trying to calculate the born effective charges of my case, the obtained
diagonalized principal values of effective charge tensor have imaginary
part.
The system has been relaxed carefully using Perdew-Zunger ultrasoft
psuedopotentilas by ecutoff=50 (55) Ry, and performing the BZ integration in
a 6×6×6 grid with 27 reduced
number of k points in the irreducible edge of the 1st BZ.
What may cause the problem?
Thanks for any comment.
Yours,
M. Abbasnejad
University of Tehran
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