<div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><span dir="ltr" style="min-height:0px" class="gmail-_ao3e gmail-selectable-text gmail-copyable-text"><span class="gmail-x1lliihq">Dear QE Community, <br></span></span></div><div><span dir="ltr" style="min-height:0px" class="gmail-_ao3e gmail-selectable-text gmail-copyable-text"><br></span></div><div>I am facing an unexpected discrepancy in k-point sampling during calculations for VS₂ and VSe₂, both of which have hexagonal symmetry. I
used the same Monkhorst-Pack k-point grid (<code>K_POINTS automatic 18x18x1</code>) for both, yet the number of k-points in the irreducible Brillouin zone (IBZ) differs significantly:</div><div><span dir="ltr" style="min-height:0px" class="gmail-_ao3e gmail-selectable-text gmail-copyable-text"><span class="gmail-x1lliihq"><ul class="gmail-x13faqbe gmail-xeaf4i8 gmail-x1n2onr6 gmail-x1gslohp gmail-x12nagc gmail-x1i64zmx" dir="ltr"><li dir="auto" class="gmail-x1ye3gou gmail-x1jieuv1 gmail-xo7wnuk gmail-x1sy0ulg gmail-xt1y1ed gmail-xlu7um4 gmail-xm78dhd gmail-x1r4uxqn"><span class="gmail-_ao3e gmail-selectable-text gmail-copyable-text">VS₂: 37 k-points</span></li><li dir="auto" class="gmail-x1ye3gou gmail-x1jieuv1 gmail-xo7wnuk gmail-x1sy0ulg gmail-xt1y1ed gmail-xlu7um4 gmail-xm78dhd gmail-x1r4uxqn"><span class="gmail-_ao3e gmail-selectable-text gmail-copyable-text">VSe₂: 164 k-points</span></li></ul></span><span class="gmail-x1lliihq">
</span><span class="gmail-x1lliihq"></span></span></div><div>To investigate, I also defined the lattice structure of VSe₂ using <code>ibrav=4</code>, but the IBZ k-point count remains 164. I have attached the nscf input and output files for both systems for reference.</div>I would appreciate any insights on this matter, particularly on how to
reduce the IBZ k-points for VSe₂, as it is critical for GW calculations.
I also appreciate your time and suggestions.</div><div dir="ltr"><span class="gmail_signature_prefix"><br></span></div><div dir="ltr"><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><b><font><font>Best Regards</font></font></b></div><div><span style="color:rgb(68,68,68)"><span style="background-color:rgb(255,255,255)"><font><font>Zimmi Singh</font></font></span></span></div><div><span style="color:rgb(68,68,68)"><span style="background-color:rgb(255,255,255)"><i><font><font>Research_Scholar <br></font></font></i></span></span></div><div><span style="color:rgb(68,68,68)"><i>Department of Metallurgical and Materials Engineering<br>
Indian Institute of Technology, Kharagpur<br>
Kharagpur, India</i></span></div><div><font><font><br></font></font></div></div></div></div></div></div></div>