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<p>Dear Yuwei,</p>
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<p>This is very basic. I recommend you to check this QE school: <a href="https://www.youtube.com/watch?v=_AfmMHnwDew" class="x_OWAAutoLink" id="LPlnk958688">
https://www.youtube.com/watch?v=_AfmMHnwDew</a></p>
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<p>One way how to do it is to plot the density of states and see whether there is band gap.
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<p>HTH</p>
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<p>Iurii<br>
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<font size="3" face="'Times New Roman', Times, serif" color="808080">--<br>
<span style="font-family:Cambria,Georgia,serif">Dr. Iurii TIMROV</span><br>
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<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> users <users-bounces@lists.quantum-espresso.org> on behalf of ΒνΣκή± <mayw2023@lzu.edu.cn><br>
<b>Sent:</b> Wednesday, October 11, 2023 3:19:12 PM<br>
<b>To:</b> users@lists.quantum-espresso.org<br>
<b>Subject:</b> [QE-users] QE-TDDFT TDDFT calculation of absorption spectrum problems</font>
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<div class="PlainText">Dear Iurii,<br>
Thank you very much for your patience in answering my questions.<br>
I have one last question. What are the signs from the vc-relax output file to check and verify that the system is relaxed to a non-metallic ground state? Could you please advise me again? Thank you very much.<br>
Yours sincerely,<br>
Yuwei Ma.<br>
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