dipoles in electric field

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1

Hi

I am trying to understand electric field effect on dipoles. I used

atom_style hybrid sphere dipole

when I give an electric field using fix efield I don’t see any effect on the dipoles due to this electric field

please help

Regards

Nishanth

2

Hi

I am trying to understand electric field effect on dipoles. I used

atom_style hybrid sphere dipole

when I give an electric field using fix efield I don't see any effect on the
dipoles due to this electric field

there is not enough information here to make any meaningful statement.

axel.

3

Hi
Does the electric field in lammps interact only point dipoles or also with spherical dipoles , because I don’t see any extra force on the spherical dipoles when I use this electric field

Regards
Nishanth

4

What are you calling a spherical dipole?

LAMMPS allows definition of point dipoles, and as the fix efield doc page says:

Add a force F = qE to each charged atom in the group due to an external electric field being applied to the system. If the system contains point-dipoles, also add a torque on the dipoles due to the external electric field.

Steve

5

Hi Steve,

The atom style used is hybrid one of dipoles and spherical particles

atom_style hybrid sphere dipole

1.but are the force and torque applicable on this type of atoms??
2. is there any default charge the dipoles take or do we need to fix one ??

Regards
Nishanth

6

atom_style hybrid sphere dipole

Those are point dipoles assigned to spheroidal, finite-sizeparticles. Fix efield will induce torque on the particles.
You would have to integrate them with rotation, e.g.
fix nve/sphere to have them rotate, The read_data and
create_atoms command explain how such particles
are initialized with their dipole moments. The set command
can also be used to change them.

Steve