Why are symmetries with fractional translations disabled in supercells?<div><br></div><div>David Strubbe</div><div>MIT<br><br><div class="gmail_quote">On Fri, Dec 21, 2012 at 8:14 AM, Stefano de Gironcoli <span dir="ltr"><<a href="mailto:degironc@sissa.it" target="_blank">degironc@sissa.it</a>></span> wrote:<br>
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<div>in supercells symmetries with
fractionary translations are disabled<br>
if your original cell has FT that could be the reason<br>
<br>
stefano<div><div class="h5"><br>
<br>
On 12/21/2012 01:25 PM, Feng Tian wrote:<br>
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<pre>Dear QE users and developers,
I run two calculations of two
crystal structures with D6h symmetry, but they gave different number of
symmetry operations. Two crystal structures are unit cell (1*1*1) structure
and a 4*4*4 supercell expanded by unit cell. The unit cell and supercell
give 24 and 12 symmetry operations, respectively. Does anyone know why?
Thanks a lot.
Feng
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