On planar quantum dynamics of a magnetic dipole moment in the presence   of electric and magnetic fields
  The planar quantum dynamics of a neutral particle with a magnetic dipole moment in the presence of electric and magnetic fields is considered. The criteria to establish the planar dynamics reveal that the resulting nonrelativistic Hamiltonian has a simplified expression without making approximations, and some terms have crucial importance for system dynamics. 
Edilberto O. Silva
hep-th math-ph math.MP quant-ph