[Pw_forum] nanotubes symmetry

[Paolo Giannozzi]

On Jul 5, 2008, at 13:21 , zahra sadat naghavi wrote:
> Armchairs  and Zigzags  nanotubes have  24 symmetry oprerations.of  
> course it is important that in which latticce they are located but  
> in Hexagonal we expected 24 symmetrys for (6,6) but pw.x does not  
> distinguish horizental mirror planes and talk about only 12.
>
pw.x finds only symmetry operations that i) are compatible with the  
lattice,
ii) are there, as explained in detail in the user guide.
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Paolo Giannozzi, Dept of Physics, University of Udine
via delle Scienze 208, 33100 Udine, Italy
Phone +39-0432-558216, fax +39-0432-558222