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If your k point grid is fine enough, if you plot lambda as a
function of the broadening there is a plateau, i.e. it looks like
this:<br>
<br>
lambda<br>
^<br>
|\<br>
| \<br>
| \______ <-- converged value<br>
| \<br>
|_________\__> broadening<br>
<br>
<br>
The correct value of lambda is the one on the plateau<br>
<br>
<br>
hth<br>
<br>
<br>
<div class="moz-cite-prefix">On 10/06/2014 07:11 AM, Elio Physics
wrote:<br>
</div>
<blockquote cite="mid:BLU179-W813087C5CC06D6D9DE3CFBEAA50@phx.gbl"
type="cite">
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<div dir="ltr">Hello all,
<div><br>
</div>
<div>I have calculated the electron phonon interaction of a
system I am working on and got the following results:</div>
<div><br>
</div>
<div>
<div> Electron-phonon coupling constant, lambda</div>
<div><br>
</div>
<div> Broadening 0.0050 lambda 0.0004 dos(Ef) 0.0038</div>
<div> Broadening 0.0100 lambda 0.0630 dos(Ef) 0.5291</div>
<div> Broadening 0.0150 lambda 0.1143 dos(Ef) 1.0535</div>
<div> Broadening 0.0200 lambda 0.1077 dos(Ef) 1.4146</div>
<div> Broadening 0.0250 lambda 0.0919 dos(Ef) 1.8217</div>
<div> Broadening 0.0300 lambda 0.0860 dos(Ef) 2.2762</div>
<div> Broadening 0.0350 lambda 0.0911 dos(Ef) 2.7504</div>
<div> Broadening 0.0400 lambda 0.1039 dos(Ef) 3.2086</div>
<div> Broadening 0.0450 lambda 0.1203 dos(Ef) 3.6247</div>
<div> Broadening 0.0500 lambda 0.1368 dos(Ef) 3.9875</div>
</div>
<div><br>
</div>
<div>I do not really understand how to interpret these results.
Do we need to choose only one of those broadening values or
should the value of lambda be the same for all of the
broadening values, i.e convergence?.....Is there any document
or (maybe paper) which can actually help me to understand
these numbers. Your help is highly appreciated.</div>
<div><br>
</div>
<div><br>
</div>
<div>Thanks in advance</div>
<div><br>
</div>
<div>Elio</div>
<div>University of Rondonio</div>
<div>Brazil </div>
</div>
<br>
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<br>
<pre class="moz-signature" cols="72">--
Dr. Lorenzo Paulatto
IdR @ IMPMC -- CNRS & Université Paris 6
+33 (0)1 44 275 084 / skype: paulatz
<a class="moz-txt-link-freetext" href="http://www.impmc.upmc.fr/~paulatto/">http://www.impmc.upmc.fr/~paulatto/</a>
23-24/4é16 Boîte courrier 115, 4 place Jussieu 75252 Paris Cédex 05</pre>
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