<div dir="ltr"><br><div class="gmail_extra">On Tue, Sep 29, 2015 at 7:45 PM, Zahra Taghipour <span dir="ltr"><<a href="mailto:ztaghipour@unm.edu" target="_blank">ztaghipour@unm.edu</a>></span> wrote:<br><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
This is semiconductor system with a band gap of about 215 meV!<br>[...] However, the result of scf for the occupations is :<br>
highest occupied, lowest unoccupied level (ev): 4.5710 3.9043<br>
<br>
Scf calculation converged without using smearing, but as you see highest occupied level is higher than the lowest unoccupied one!<br></blockquote><div><br></div><div>so your semiconductor is not a semiconductor, it is a semimetal, at least according to DFT. Never heard about the "band gap problem"?<br><br></div><div>Paolo<br></div></div><br>-- <br><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><span><span><font color="#888888">Paolo Giannozzi, Dept. Chemistry&Physics&Environment,<br>
Univ. Udine, via delle Scienze 208, 33100 Udine, Italy<br>
Phone <a href="tel:%2B39-0432-558216" value="+390432558216" target="_blank">+39-0432-558216</a>, fax <a href="tel:%2B39-0432-558222" value="+390432558222" target="_blank">+39-0432-558222</a></font></span></span></div></div></div></div>
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