  From our theoretical studies of resonant Raman transitions in two-electron
quantum dots (artificial helium atoms) we show that in this system, the
singlet-triplet Raman transitions are allowed (in polarized configuration) only
in the presence of spin-orbit interactions. With an increase of the applied
magnetic field this transition dominates over the singlet-singlet and
triplet-triplet transitions. This intriguing effect can therefore be utilized
to tune Raman transitions as well as the spin-orbit coupling in few-electron
quantum dots.
