Dear Nicola,<br>Thanks for your reply.<br>What I want to do is the calculate the different orbital overlap. I mean for example for Ti atom, I want to know how to calculate the Wannier function for dz2 orbital and dxy orbital and then to calculate the overlap between these orbitals, not only the total d orbitals.<br>
<br>besides,<br>I read through the output file for wannier90, I find that inside it there are a number of wavefunctions which is stated with WF centre and spread. If you know what is these WFs, please explain this to me.<br>
<br><br>A lot of Thanks!<br><br>Wen<br><br><div class="gmail_quote">On Wed, Jul 15, 2009 at 10:43 PM, Nicola Marzari <span dir="ltr"><<a href="mailto:marzari@mit.edu">marzari@mit.edu</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><div></div><div class="h5">?? wrote:<br>
> Dear All,<br>
> Currently I am trying to use Wannier 90 code under Quantum espresso<br>
> folder to calculate the overlaps between different orbitals for<br>
> different atoms.<br>
> What I find in the W90 tutorial is that it produce a .mmn file to give<br>
> the overlap matrix in k space. But what I need is the overlaps for<br>
> different orbitals rather than the total overlaps.<br>
> Anybody has the experience to use Wannier 90 code to calculate the<br>
> overlaps for different orbitals in real space? Please help<br>
<br>
<br>
</div></div>Dear Wen,<br>
<br>
<br>
can you detail better with orbitals are you referring to ?<br>
<br>
Mmn are <u_mk|u_nk'>, where u_mk is the periodic part of the Bloch<br>
eigenstate for band m, k-point k. Localized orbitals such as Wannier<br>
functions are orthogonal - zero overlap.<br>
<br>
nicola<br>
<br>
---------------------------------------------------------------------<br>
Prof Nicola Marzari Department of Materials Science and Engineering<br>
13-5066 MIT 77 Massachusetts Avenue Cambridge MA 02139-4307 USA<br>
tel 617.4522758 fax 2586534 <a href="mailto:marzari@mit.edu">marzari@mit.edu</a> <a href="http://quasiamore.mit.edu" target="_blank">http://quasiamore.mit.edu</a><br>
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