Syntax:

ionic-gaussian-potential <species> <U0> <sigma> <geometry> [center <x> <y> <z>]

Description:

Apply external potential and forces to ions of specified <species>. The potential is Gaussian with peak value <U0> Hartrees and standard deviation <sigma> bohrs, and is centered at the origin by default. The symmetry of the potential is specified by <geometry>, which may be one of:

Spherical: The potential is 0-D and confined near the origin.
Cylindrical: The potential is 1-D and extends along the z-direction.
Planar: The potential is 2-D and extends in the xy-plane. Optionally, the center of the potential may be shifted by specifying center <x> <y> <z>, where the format of <x>, <y>, and <z> are specified by the coords-type. Note that the coordinates of the atoms are taken in minimum-image convention for the unit cell centered at the origin for the potential and force calculation. This command is intended primarily for applying perturbations in ionic dynamics.

Properties:

Requires: coords-type ion latt-scale

Forbids: (None)

Allow multiple: yes

Default: (None)

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