<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Hello,<div class=""><br class=""></div><div class="">You can find the k vectors for hexagonal Si here:</div><div class=""><a href="https://www.cryst.ehu.es/cgi-bin/cryst/programs/nph-kv-list" class="">https://www.cryst.ehu.es/cgi-bin/cryst/programs/nph-kv-list</a></div><div class="">I have chosen the "simplest" hexagonal system (n°168), but you can change it if necessary here:</div><div class=""><a href="https://www.cryst.ehu.es/cryst/get_kvec.html" class="">https://www.cryst.ehu.es/cryst/get_kvec.html</a></div><div class=""><br class=""></div><div class="">From the list of k vectors you can choose the path you want to follow for your calculations. The path can be generated with xcrysden:</div><div class=""><a href="http://www.xcrysden.org/" class="">http://www.xcrysden.org/</a></div><div class=""><br class=""></div><div class="">Now, for the lists of k vectors you are mentioning below, both are valid: the choice for the path is at your discretion. But, if you want to check your results by comparing with other works, then you may want to choose the same path.</div><div class=""><br class=""></div><div class="">HTH,</div><div class="">Pascal</div><div class=""><br class=""></div><div class=""><br class=""><div class="">
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text-indent: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px;"><span class="" style="font-size: 16pt; font-family: Mistral;">Pascal Boulet</span></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px;"><font face="Lucida Handwriting" class=""><span class="" style="font-size: 21px;">—</span></font></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px;"><em class="" style="color: rgb(34, 187, 234); font-family: verdana; font-size: 11px; line-height: 22px;">Professor in computational materials - DEPARTMENT OF CHEMISTRY</em></div><div class=""><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px; font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif; font-size: 15px; line-height: 22px;"><span class="" style="font-size: 11px; font-family: verdana;">University of Aix-Marseille </span><span class="" style="font-size: 11px; font-family: verdana;">- Avenue Escadrille Normandie Niemen - F-13013 Marseille - FRANCE</span></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px; font-family: Tahoma, Verdana, Arial, Helvetica, sans-serif; font-size: 15px; line-height: 22px;"><span class="" style="font-size: 11px; font-family: verdana;">Tél: +33(0)4 13 55 18 10 - Fax : +33(0)4 13 55 18 50</span></div><div class="" style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0); letter-spacing: normal; text-transform: none; white-space: normal; word-spacing: 0px; text-decoration: none; -webkit-text-stroke-width: 0px;"><font face="verdana" class=""><span class="" style="font-size: 12px; line-height: 22px;">Email : </span></font><font color="#22bbea" face="verdana" class=""><span style="font-size: 12px; line-height: 20px;" class=""><a href="mailto:pascal.boulet@univ-amu.fr" class="">pascal.boulet@univ-amu.fr</a></span></font></div><div class="" style="font-size: 14px;"><br class=""></div></div></div></div></div><br class="Apple-interchange-newline"></div></div></div></div></div><div><br class=""><blockquote type="cite" class=""><div class="">Le 20 mai 2020 à 20:10, Chaman Gupta <<a href="mailto:chaman@uw.edu" class="">chaman@uw.edu</a>> a écrit :</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family: "trebuchet ms", sans-serif; font-size: small;"><div class="gmail_default">Hey everyone,</div><div class="gmail_default"><br class=""></div><div class="gmail_default">I am trying to study the effect of pressure on the band structure of <u class="">'Si - simple hexagonal (Phase V)</u>', which is stable between 17 to 30 GPa (approx.)</div><div class="gmail_default"><br class=""></div><div class="gmail_default">Here is a paper published in Nature (<a href="https://www.nature.com/articles/s41586-020-2150-y" target="_blank" style="font-family:Arial,Helvetica,sans-serif" class="">https://www.nature.com/articles/s41586-020-2150-y</a>), which has a figure with the band structure of Hex-Si (image is attached). The image has <u class="">" A, Gamma, M, U, L "</u> k-points.</div><div class="gmail_default"><br class=""></div><div class="gmail_default"><a href="https://drive.google.com/file/d/1zaJSjv3RX3gy87NTuBV5AjkJysW7pdOZ/view?usp=sharing" class="">IMAGE 1 IS HERE</a></div><div class="gmail_default"><br class=""></div><div class="gmail_default"><div class="">When I looked for BZ1 or high symmetry points for simple hexagonal structure, I came across this link (<a href="http://lamp.tu-graz.ac.at/~hadley/ss1/bzones/hexagonal.php" target="_blank" style="font-family:Arial,Helvetica,sans-serif" class="">http://lamp.tu-graz.ac.at/~hadley/ss1/bzones/hexagonal.php</a>) (Image attached). It mentions the Symmetry points to be <u class="">"Gamma, A, K, H, M, L"</u><br class=""></div></div><div class="gmail_default"><br class=""></div><div class="gmail_default"><a href="https://drive.google.com/file/d/1D4-buR2XPTlP5LzIypFjcehicfPg3YZO/view?usp=sharing" class="">IMAGE 2 IS HERE</a></div><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><br class=""></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default">My questions:</span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style=""><br class=""></span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style="">1. From what I understand, symmetry points are dependent on the type of lattice, and highly affect the band structure. Is this statement right or wrong?</span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style=""><br class=""></span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style="">2. Which k-points/ High symmetry points/ BZ1 should I use for my band structure calculation?</span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style=""><br class=""></span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style="">3. Is it possible, by any chance the author of this Nature paper, might have used the wrong k-points? Or should I use what they have used?</span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style=""><br class=""></span></font></div><div style="color:rgb(34,34,34);font-family:Arial,Helvetica,sans-serif" class=""><font face="trebuchet ms, sans-serif" class=""><span class="gmail_default" style="">Thanks for the help</span></font></div></div></div></div></div></div></div></div></div></div><div class=""><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><div dir="ltr" class=""><font face="trebuchet ms, sans-serif" class=""><br class=""></font></div><div dir="ltr" class=""><font face="trebuchet ms, sans-serif" class="">Regards,</font><div class=""><font face="trebuchet ms, sans-serif" class=""><br class=""></font></div><div class=""><b class=""><font face="trebuchet ms, sans-serif" class="">Chaman Gupta</font></b><div class=""><font face="trebuchet ms, sans-serif" class="">Graduate Research Student, <i class=""><a href="http://depts.washington.edu/nrglab/" target="_blank" class="">Novosselov Research Group</a>, UW</i><br class=""></font></div><div class=""><font face="trebuchet ms, sans-serif" class="">Graduate Research Student, <i class=""><a href="https://depts.washington.edu/pzlab/wordpress/" target="_blank" class="">Pauzauskie Research Group</a>, UW</i></font></div><div class=""><font face="trebuchet ms, sans-serif" class="">University of Washington Seattle, <i class="">M.S. in Mechanical Engineering</i></font></div><div class=""><font face="trebuchet ms, sans-serif" class="">IIT Kharagpur, <i class="">B.Tech in Metallurgical and Materials Engineering</i></font></div><div class=""><font face="trebuchet ms, sans-serif" class=""><b class=""><a href="https://www.linkedin.com/in/professorchamangupta" target="_blank" class="">Linked In</a> | <a href="mailto:chaman@uw.edu" target="_blank" class="">Email</a> | </b></font><span style="font-family:"trebuchet ms",sans-serif" class=""><b class="">P</b>: +1 (206) 383-3514</span></div></div></div></div></div></div></div></div></div></div></div></div>
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