Vector Field

The vector field is defined by the origins and vectors, and it is visualized by the arrows. The vector field is useful for visualizing the magnetic moment, phonon visualization, etc.

Magentic moment visualization

Show the magnetic moment as a vector field.

from ase.build import bulk
from weas_widget import WeasWidget
import numpy as np
atoms = bulk("Fe", cubic=True)
atoms*=[2, 2, 1]
atoms.set_array("moment", np.ones(len(atoms)))
viewer = WeasWidget()
viewer.from_ase(atoms)
viewer.avr.model_style = 1
viewer

Interactive phonon visualization

One can visualize the phonon dispersion via lattice vibrations. One only need to use the eigenstates (calculated with an external software) to generate the trajectory. Each eigenvector should has the real and imaginary part. One can also specify the kpoint, amplitude, nframes, repeat, color, and radius.

import numpy as np
from ase.build import bulk
from weas_widget import WeasWidget
atoms = bulk("Fe", cubic=True)
phonon_setting = {"eigenvectors": np.array([[[0, 0], [0, 0],[0.5, 0]],
                                    [[0, 0], [0, 0], [-0.5, 0]]]
                                   ),
        "kpoint": [0, 0, 0], # optional
        "amplitude": 5, # scale the motion of the atoms
        "factor": 1.5, # scale the length of the arrows
        "nframes": 20,
        "repeat": [4, 4, 1],
        "color": "blue",
        "radius": 0.1,
        }
viewer = WeasWidget()
viewer.from_ase(atoms)
viewer.avr.phonon_setting = phonon_setting
viewer