<div dir="ltr">and I am using QE-6.3 version.<br></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, May 6, 2020 at 9:21 PM Neelam Swarnkar <<a href="mailto:neelamswarnkar35@gmail.com">neelamswarnkar35@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Dear Giuseppe & all</div><div><br></div><div>I had plotted the band gap which represent the metal type of material. but in most of research paper ,its band gap =0.72 eV, or some reported a range of band gap = 0.53 to 0.61 eV [1 ZnSbcomputational stydy], which represent ZnSb semiconductor type of behavior.<br></div><div><br></div><div>my plotted band gap attached here . I think , i have choose wrong pseudopotential file.<br></div><div>So, pl. give me direction or guidelines to calculate semiconductor band gap of ZnSb thermoelectric material.<br></div><div><br></div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, May 6, 2020 at 6:08 PM Giuseppe Mattioli <<a href="mailto:giuseppe.mattioli@ism.cnr.it" target="_blank">giuseppe.mattioli@ism.cnr.it</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><br>
Dear Neelam Swarnkar<br>
What do you mean when you say "correct band gap"? A literature <br>
experimental value? A literature calculated value? In the former case, <br>
the compatibility depends on the exchange-correlation functional you <br>
use. There is plenty of literature on this, you just have to type "DFT <br>
underestimation band gap" in google to have an idea. In the latter <br>
case, if you are trying to reproduce the results of previous <br>
theoretical calculations, then you must use the same theoretical setup <br>
in a proper way, and it is impossible to help you if you don't post <br>
relevant information (QE version, input, ...)<br>
HTH<br>
Giuseppe<br>
<br>
Quoting Neelam Swarnkar <<a href="mailto:neelamswarnkar35@gmail.com" target="_blank">neelamswarnkar35@gmail.com</a>>:<br>
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> Date: Wed, May 6, 2020, 3:25 PM<br>
> Subject: problem in band gap<br>
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> Date: Wed, 6 May 2020 15:24:49 +0530<br>
> Subject: problem in band gap<br>
> Dear All<br>
><br>
> I am new for using quantum espresso-6.3. i am calculating the scf ,nscf,<br>
> bands, etc of ZnSb thermoelectric material this material belongs to Pbca<br>
> (61) space group. and had orthorhombic crystal structure , no of electrons<br>
> =8.<br>
><br>
><br>
> I have done scf, nscf calculation and band calculation but not found the<br>
> correct band gap.<br>
><br>
> I don't know what wrong in this , or may be choose wrong psedopotential.<br>
><br>
> please explain to me , correct way to calculate correct band gap.<br>
> Zn.in and Zn.out is my scf calculation.<br>
><br>
> QE-user<br>
> Neelam Swarnkar<br>
> Phd scholar<br>
<br>
<br>
<br>
GIUSEPPE MATTIOLI<br>
CNR - ISTITUTO DI STRUTTURA DELLA MATERIA<br>
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E-mail: <<a href="mailto:giuseppe.mattioli@ism.cnr.it" target="_blank">giuseppe.mattioli@ism.cnr.it</a>><br>
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