Re: [QE-users] Symmetries in the dynamical matrix

2018-10-18 Thread Paolo Giannozzi
Not sure about this specific case, but only some of the symmetries of the dynamical matrix are enforced in the calculation (in particular: symmetries wrt operations of the small group of q). Other symmetries are not enforced and should "emerge naturally" from the calculation. If I remember

[QE-users] Symmetries in the dynamical matrix

2018-10-18 Thread JAY Antoine
Dear all, I'am trying to understand the symmetries of the dynamical matrix given in the phonon output : Dynamical Matrix in cartesian axes q = (    0.0   0.0   0.0 )     1    1   0.26846543  0.   -0.00021832  0.   -0.00074984  0.  -0.00021197 

[QE-users] Symmetries in the dynamical matrix

2018-10-16 Thread JAY Antoine
Dear all, I'am trying to understand the symmetries of the dynamical matrix given in the phonon output : Dynamical Matrix in cartesian axes q = (    0.0   0.0   0.0 )     1    1   0.26846543  0.   -0.00021832  0.   -0.00074984  0.  -0.00021197