Even after following a very strict convergence criteria for SCF and Ph.X calculations I am getting some imaginary frequencies. I just wish to find out which all vibrations are causing these imaginary frequency to occur.
Have you tried XCrysDen? I use it to view my input/output files From QE; but I'm not sure if it works for phonons too.
While creating dynamical matrix using dynmat.x a file dynmat.axsf is created. XCrysden can be used to view that file, but I have tried using it, it doesn't show any vibrational modes to me. Either I am not using it properly or may be it can't be used for the same. Any information from a regular user would be of great help.
Thanks Ivor, it helps. One more query though, I can view forces as arrow (which solves my purpose) but is their any way to see an animation of the same.
Yes, you can create an animation too. Go to Modify->animation control, here you can see all your coordinates (like during optimization,etc.). Just click on the double foreward arrow button and it starts going.
Saeed, I wish to see the animation of each mode specifically. What this gives is an animation of all the modes all together.
Please refer
http://www.fisica.uniud.it/~giannozz/QE-Tutorial/tutorial_phon.html
http://www.quantum-espresso.org/wp-content/uploads/2013/06/phonons_tutorial_shanghai1.pdf
and
http://people.sissa.it/~degironc/QE-Tutorial/tutorial_disp.htm
Procedure in earlier pdf produces .axsf. It also produces .mold file along with .out and .axsf.
This .mold file can be viewed in the open source software package MOLDEN.
It is possible to view vibrations at each K-point using .mold file and MOLDEN.
http://www.fisica.uniud.it/~giannozz/QE-Tutorial/tutorial_phon.html
http://people.sissa.it/~degironc/QE-Tutorial/tutorial_disp.htm
http://www.quantum-espresso.org/wp-content/uploads/2013/06/phonons_tutorial_shanghai1.pdfhttp://www.quantum-espresso.org/wp-content/uploads/2013/06/phonons_tutorial_shanghai1.pdf
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