<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin">Hi, All<o:p></o:p></span></p>

<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin">I calculate
the band structure of LiF crystal, but the results show that the band lines
cross, that is very strange. The input files and results are attached, the version
of the QE codes employed is v5.2.0.</span></p>

<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin">I do not
know to fix the problem. Your suggestions or comments are highly appreciated.<o:p></o:p></span></p>

<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin">Regards.<o:p></o:p></span></p>

<p class="MsoNormal"><br></p>

<p class="MsoNormal"><span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-hansi-theme-font:major-latin">Evan<o:p></o:p></span></p>

<span lang="EN-US" style="font-size:12.0pt;font-family:"Cambria","serif";
mso-ascii-theme-font:major-latin;mso-fareast-font-family:;mso-fareast-theme-font:
minor-fareast;mso-hansi-theme-font:major-latin;mso-bidi-font-family:"Times New Roman";
mso-bidi-theme-font:minor-bidi;mso-ansi-language:EN-US;mso-fareast-language:
ZH-CN;mso-bidi-language:AR-SA">USC, China</span></div><br><br><span title="neteasefooter"><p> </p></span>