Use the Lorentz Force node to add the contribution from the magnetic vector potential
A to the kinetic momentum
P, given by
Note that there is no minus sign in front of the imaginary unit i because of the engineering sign convention adopted by all COMSOL physics interfaces: a plane wave is
exp(−ikx + iωt), not
exp(ikx − iωt).
The Lorentz Force node adds the second term in
Equation 5-2. Enter the magnetic vector potential components in units of
Wb/m. The default is
0.