<div dir="ltr"><div>You are thinking to the so-called "conventional" (simple cubic) cell, but QE uses the "primitive" (smallest) cell</div><div><br></div><div>Paolo<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Mar 14, 2019 at 7:17 PM yasmin kani <<a href="mailto:yasminkani8@gmail.com">yasminkani8@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">I can't understand the concept ibrav used in QE. because ibrav=2 defines fcc lattice. In fcc there are four atoms per unit cell but we give nat=2. why?<br></div>
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