<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Quite likely your system is a semiconductor and you did not include the conduction bands in the pw.x calculation (nbnd set to its default value).<div class=""><br class=""></div><div class="">You can use the nbnd parameter to this purpose.</div><div class=""><br class=""></div><div class="">Giovanni</div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><div><blockquote type="cite" class=""><div class="">On 18 Jan 2016, at 12:19, <a href="mailto:omamuyovwiakemu@yahoo.com" class="">omamuyovwiakemu@yahoo.com</a> wrote:</div><br class="Apple-interchange-newline"><div class=""><table cellspacing="0" cellpadding="0" border="0" class=""><tbody class=""><tr class=""><td valign="top" class=""><p dir="ltr" class="">Dear QE users,</p><p dir="ltr" class="">Pls I encountered a challenge while trying to plot the band structure for a binary alloy.<br class="">
I realize after using plotband.x interactively that the conduction bands(top bands) were not present on the <br class="">
plot. I increased the range but all no avail. I also discovered that conduction bands isn't available on the band file as expected. It's been impossible to get the band gap ( the difference between the valence and conduction bands). </p><p dir="ltr" class="">Pls I will sincerely appreciate any comment on what to do to fix this problem.<br class="">
Thank you.<br class=""></p><p dir="ltr" class="">Jolayemi Omamuyovwi Rita(Mrs)<br class="">
Research Student<br class="">
Department of Physics<br class="">
University of Benin<br class="">
Nigeria.<br class="">
<a href="https://overview.mail.yahoo.com/mobile/?.src=Android" class="">Sent from Yahoo Mail on Android</a></p>
</td></tr></tbody></table>_______________________________________________<br class="">Pw_forum mailing list<br class=""><a href="mailto:Pw_forum@pwscf.org" class="">Pw_forum@pwscf.org</a><br class="">http://pwscf.org/mailman/listinfo/pw_forum</div></blockquote></div><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div class="">-- <br class=""><br class="">Giovanni Cantele, PhD<br class="">CNR-SPIN<br class="">c/o Dipartimento di Fisica<br class="">Universita' di Napoli "Federico II"<br class="">Complesso Universitario M. S. Angelo - Ed. 6<br class="">Via Cintia, I-80126, Napoli, Italy<br class="">e-mail: <a href="mailto:giovanni.cantele@spin.cnr.it" class="">giovanni.cantele@spin.cnr.it</a><br class="">Phone: +39 081 676910<br class="">Skype contact: giocan74<br class=""><br class="">ResearcherID: <a href="http://www.researcherid.com/rid/A-1951-2009" class="">http://www.researcherid.com/rid/A-1951-2009</a><br class="">Web page: <a href="http://people.na.infn.it/~cantele" class="">http://people.na.infn.it/~cantele</a><br class=""></div></div><div class=""><br class=""></div></body></html>