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<blockquote type="cite" style="color: rgb(49, 53, 59); line-height: 22.4px; font-family: Verdana, 'Microsoft Yahei', SimSun, sans-serif; border-left-color: grey; border-left-width: thin; border-left-style: solid; margin: 5px; padding-left: 10px;"><div style="font-family: 微软雅黑, Verdana, 'Microsoft Yahei', SimSun, sans-serif; line-height: 1.6;"><div>Dear All,</div><div><br></div><div>When doing a test of graphene by the tetrahedra_opt method, I fount it prints the complete negative frequencies if using the nq (6x6x1), while right for nq (6x6x2) but cost more times. See the attachment. </div><div><br></div><div>So, what's wrong? How to improve my input files to calculate the phonon of 2D materials by <span style="line-height: 22.4px;">tetrahedra_opt method</span><span style="line-height: 22.4px;">. Should the number of nq3 be larger than 1 for the </span><span style="line-height: 22.4px;">tetrahedra_opt method</span><span style="line-height: 22.4px;">? </span></div><div><br></div><div>Thanks.</div><div><br></div><div>Best regards,</div><div><br></div><div>YP</div><div><br></div><div>HTU</div></div></blockquote></div>
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