<div dir="ltr"><div><div><div><div>Thanks Prof. Paulatto and Prof. Giannozzi for the clarification.<br><br></div>With Regards,<br></div>Koushik<br></div>JNCASR<br></div>Bangalore-560064<br><div><div><div><div><div>
><br>
> Dear PW users,<br>
> I need some clarifications on the input file of pp.x. In the &inputpp<br>
> namelist, what does the "kpoint" mean?<br>
> To be specific, If I want to visualize the charge density of a<br>
> particular band ("kband") at any arbitrary k-point in the Brillouin<br>
> zone (e.g at Gamma (0, 0, 0) and Z(0, 0, 0.5)) what "kpoint" (integer)<br>
> values should I specify in each case in the &inputpp namelist?<br>
> Thanks in advance.<br>
Dear Koushik,<br>
the charge density is obtained after a sum over the occupied k-points<br>
and bands, so you cannot print it for a single k-point.<br>
<br>
On the other hand, you can plot the contribution from a specific point<br>
"k" and band "n", which is the square modulus of the wavefunction<br>
\psi_{k,n}.<br>
<br>
The value of "kpoint" in &inputpp is the index of the k-point, as listed<br>
in the output of pw.x. If you want to plot a specific point that is not<br>
in the list you will have to do a nscf calculation first.<br>
<br>
best regards<br>
<br>
--<br>
Dr. Lorenzo Paulatto<br>
IdR @ IMPMC -- CNRS & Universit? Paris 6<br>
phone: +33 (0)1 44275 084 / skype: paulatz<br>
www: <a href="http://www-int.impmc.upmc.fr/%7Epaulatto/" target="_blank">http://www-int.impmc.upmc.fr/~paulatto/</a><br>
mail: 23-24/4?16 Bo?te courrier 115, 4 place Jussieu 75252 Paris C?dex 05<br>
<br>
<br>
<br>
------------------------------<br>
<br>
Message: 5<br>
Date: Thu, 02 May 2013 15:47:01 +0200<br>
From: Paolo Giannozzi <<a href="mailto:paolo.giannozzi@uniud.it">paolo.giannozzi@uniud.it</a>><br>
Subject: Re: [Pw_forum] Charge density at any k-point in the Brillouin<br>
zone<br>
To: PWSCF Forum <<a href="mailto:pw_forum@pwscf.org">pw_forum@pwscf.org</a>><br>
Message-ID: <<a href="mailto:1367502421.5282.1.camel@fe12lx.fisica.uniud.it">1367502421.5282.1.camel@fe12lx.fisica.uniud.it</a>><br>
Content-Type: text/plain; charset="UTF-8"<br>
<br>
On Thu, 2013-05-02 at 18:27 +0530, koushik pal wrote:<br>
<br>
> To be specific, If I want to visualize the charge density of a<br>
> particular band ("kband") at any arbitrary k-point in the Brillouin<br>
> zone (e.g at Gamma (0, 0, 0) and Z(0, 0, 0.5)) what "kpoint" (integer)<br>
> values should I specify in each case in the &inputpp namelist?<br>
<br>
kpoint is the index of k-points as they appear in the output of pw.x<br>
<br>
P.<br>
<br>
--<br>
Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone +39-0432-558216, fax +39-0432-558222<br clear="all"><br><br>
</div></div></div></div></div></div>