[Q-e-developers] Bug report - new XML implementation does not read external field parameters properly

[Thomas Brumme]

Dear all,

Jun-Ho Lee from Korea Institute for Advanced Study, Seoul found a bug 
when he wanted to use the gate-implementation, but the bug is actually 
also there for using the external electric field via tefield = .true. / 
dipfield = .true.

It seems that the new XML implementation is not reading all input 
parameters correctly - when the code is compile with the -D__OLDXML 
flag, everything works as intended.

I tested this with the QE v.6.2 from 26. Jan 2018 compiled with GNU 
Fortran (GCC) 4.4.7 20120313 (Red Hat 4.4.7-18).
Taking the dipole_example of PP. With the old XML format, the potential 
plotted via "plot_num=11" includes the dipole correction but not in the 
new XML format.
(Note that one needs to change the run_example slightly otherwise the 
potential is not plotted; adding a

mv avg.dat ni+co.vpot-z
mv avg.dat water.vpot-z

at line 186 and 344, respectively.)

The scf run itself works without problems, also restarting.
I didn't have the time yet to check where the error occurs, but it seems 
that it is only there in the pp.x run.

Regards

Thomas

-- 
Dr. rer. nat. Thomas Brumme
Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry
Leipzig University
Phillipp-Rosenthal-Strasse 31
04103 Leipzig

Tel:  +49 (0)341 97 36456

email: thomas.brumme at uni-leipzig.de

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