[Pw_forum] symmetry operations in PW
Manoj Srivastava
manoj at phys.ufl.edu
Mon Feb 9 23:03:16 CET 2009
Dear PWSCF users and developers,
I was looking into the code where it calculates symmerty operations for
the group. Now the symmetry operations are defined as ' 90 deg rotation -
cart. axis [0,0,-1]', & ' 90 deg rotation - cart. axis [0,0,1]
I did not understand the point of defining rotation about z and -z
axis. Is this because of some numerical constraint? Also, there are
elements with 'theta' and '-theta' rotation in the same group. I was just
wondering the reason behind this. Any help will be appreciated.
Regards,
Manoj Srivastava
Department of Physics
University of Florida
Gainesville, FL, USA.
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