<div>Dear all,</div><div><br></div><div>As we know, the short-ranged IFCs are available by QE. The dynamical matrices are obtained by making inverse Fourier transformation of the short-ranged IFCs, and then add back the long-ranged dipole-dipole contribution in the reciprocal space. This paper(X. Gonze et al, PRB 50. 13035 (1994)) provides the formula of long-ranged force constants. I wonder that is it feasible to obtain the correct phonon spectrum from the full IFCs(short+long)? Of course, the long-ranged IFCs should be gotten in a much longer range(maybe 100*100*100).</div><div><br></div><div><span style="display: inline !important; float: none; background-color: rgb(255, 255, 255); color: rgb(0, 0, 0); font-family: courier,"courier new",monospace; font-size: 1em; font-style: normal; font-variant: normal; font-weight: 400; letter-spacing: normal; orphans: 2; overflow-wrap: break-word; text-align: left; text-decoration: none; text-indent: 0px; text-transform: none; -webkit-text-stroke-width: 0px; white-space: pre-wrap; word-spacing: 0px;">Any comments will be appreciated!</span><b></b><i></i><u></u><strike></strike><br></div><br><span>--<br><p>
        Jian-qi Huang
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        <span style="display:inline !important;float:none;background-color:transparent;color:#000000;font-family:" 宋体="">Magnetism and Magnetic Materials Division</span><br style="background-color:transparent;box-sizing:content-box;color:#000000;font-family:&font-size:14px;font-style:normal;font-variant:normal;font-weight:400;height:auto;letter-spacing:normal;line-height:16.8px;margin-bottom:0px;margin-left:0px;margin-right:0px;margin-top:0px;orphans:2;overflow:visible;padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;-webkit-text-stroke-width:0px;white-space:normal;width:auto;word-spacing:0px;word-wrap:break-word;">
<span style="display:inline !important;float:none;background-color:transparent;color:#000000;font-family:" 宋体="">Institute of Metal Research </span><br style="background-color:transparent;box-sizing:content-box;color:#000000;font-family:&font-size:14px;font-style:normal;font-variant:normal;font-weight:400;height:auto;letter-spacing:normal;line-height:16.8px;margin-bottom:0px;margin-left:0px;margin-right:0px;margin-top:0px;orphans:2;overflow:visible;padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;-webkit-text-stroke-width:0px;white-space:normal;width:auto;word-spacing:0px;word-wrap:break-word;">
<span style="display:inline !important;float:none;background-color:transparent;color:#000000;font-family:" 宋体="">Chinese Academy of Sciences</span><br style="background-color:transparent;box-sizing:content-box;color:#000000;font-family:&font-size:14px;font-style:normal;font-variant:normal;font-weight:400;height:auto;letter-spacing:normal;line-height:16.8px;margin-bottom:0px;margin-left:0px;margin-right:0px;margin-top:0px;orphans:2;overflow:visible;padding-bottom:0px;padding-left:0px;padding-right:0px;padding-top:0px;text-align:left;text-decoration:none;text-indent:0px;text-transform:none;-webkit-text-stroke-width:0px;white-space:normal;width:auto;word-spacing:0px;word-wrap:break-word;">
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        <span style="display:inline !important;float:none;background-color:transparent;color:#000000;font-family:" 宋体="">email:<a href="mailto:jqhuang16b@imr.ac.cn" target="_blank">jqhuang16b@imr.ac.cn</a></span> 
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