Thanks for your replies.<br><br>I know there's no k-mesh input in the input file for pwcond. Actually, I was getting different transmission coefficient values with respect to a change in the k-mesh values for the lead and scat calculations. <br>
<br>I realized that the complex band structures were actually not converged w.r.t the k-mesh. Seems like pwcond requires quite a dense k-mesh for convergence, especially for metallic systems. However, now I am getting good results.<br>
<br>Zubaer<br><br><br><br><div class="gmail_quote">On Mon, Nov 9, 2009 at 4:20 AM, Gabriele Sclauzero <span dir="ltr"><<a href="mailto:sclauzer@sissa.it">sclauzer@sissa.it</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="im"><br>
<br>
xirainbow wrote:<br>
> Dear :<br>
> I do not think pwcond can set k-mesh along the transport direction.<br>
> Instead, you can set k-mesh perpendicular to the transport direction.<br>
><br>
> The transport device can be period perpendicular to the transport direction.<br>
> However, it is not period along the transport direction<br>
<br>
</div>This is right, in the pwcond calculation the Born-von Karman PBCs are removed along the<br>
transport direction, and you need to take care only of the 2D BZ sampling in the<br>
perpendicular directions.<br>
Anyway, in the preceding pwscf calculation, periodicity is still there in all 3<br>
directions, hence you need a proper k-point sampling also along the transport direction,<br>
especially for the leads, which usually are a bulk periodic unit (hence they may not be a<br>
supercell).<br>
<br>
HTH<br>
<font color="#888888"><br>
GS<br>
</font><div class="im"><br>
><br>
> On Sat, Nov 7, 2009 at 12:46 AM, Zubaer Hossain <<a href="mailto:zubaexy@gmail.com">zubaexy@gmail.com</a><br>
</div><div class="im">> <mailto:<a href="mailto:zubaexy@gmail.com">zubaexy@gmail.com</a>>> wrote:<br>
><br>
> Dear QE users,<br>
><br>
> Is there any rule for choosing k-meshes for the lead and the<br>
> scattering region along the transport direction?<br>
><br>
> Thanks in advance,<br>
> Zubaer<br>
> UIUC<br>
><br>
><br>
><br>
><br>
> --<br>
> ____________________________________<br>
> Hui Wang<br>
> School of physics, Nankai University, Tianjin, China<br>
><br>
><br>
</div>> ------------------------------------------------------------------------<br>
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<br>
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