SectionHamiltonian Type flag Default electric_dipole + electric_quadrupole + magnetic_dipole
Terms to be included in the multipolar expansion.
For this type of coupling to make sense, the E field has to be calculated at the center of mass (not averaged).
Options:
electric_dipole:
Adds electric dipole term in length gauge, uses transverse electric field E(t):
$ H_{int} = -e (r.E) $
electric_quadrupole:
Adds electric quadrupole term:
$ H_{int} = (1/2) e (r . Q . r) $
where Q is the outer product of gradient and electric field:
$ Q_{ij} = partial_i E_j |_{r=r_0} $
magnetic_dipole:
Adds magnetic dipole term:
$ H_{int} = -i (e hbar / 2m) sum_i (B(r_0) . (r x grad)) $