<div dir="ltr"><div>Dear all,</div><div> I want to calculate the electon-phonon coupling of 2-D structure, but i encountered the two following questions.</div><div> firstly, in the file of ph.out for phonon calculation, I find the omega value is positive at almost every q point. Unfortunately, the phonon diserpsion has some big imagination frequency in .<a href="http://freq.gp">freq.gp</a> file. I do not know whether it is possible because this structure is unstable or I have some errors in the process of calculations.</div>
<div> Secondly, When I prepair the <a href="http://lambda.in">lambda.in</a> file, I found the obtained q point position by kpoint.x, which has some weight, is different from the calculated q point in ph.out file (elph.***). what should i do to get the <a href="http://lambda.in">lambda.in</a> file?</div>
<div> best regards and happy new year</div><div> dengfeng</div><div> NUS, singapore</div></div>