[CP2K:4719] dbcsr error when applying periodic efield
MattWa... at gmail.com
Mon Oct 28 14:18:29 CET 2013
On Friday, October 25, 2013 9:03:09 PM UTC+1, David Stelter wrote:
> Hi Matt,
> We have looked into EXTERNAL_POTENTIAL, some guidance on the section would
> be appreciated! I've read on these forums that people have put an efield
> value as a parameter in this section. How is this section treated? I want
> to apply an efield, but shouldn't I be putting in a potential multiplied by
> some distance of the periodic box?
in the DFT section
PARAMETERS A B
VALUES [eV] 0.1 [angstrom] 1.0
should add a field of 0.1 V/A along the Z direction of your QM cell. This
is just a classic sawtooth potential - but as your QM region has vacuum
around it there should be no issues.
As Flo notes for the periodic_efield, I think this will only act on the QM
region. Adding a similar potential over the classical region would cause
issues with periodicity.
I haven't tried it in combination with ROKS or QMMM.
Maybe an easier solution is just to add some artificial charges into the MM
region to generate the field? Though you'd have to take into account that
their effect would get screened by solvent...
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