Spin-orbit coupling and anisotropy of spin splitting in quantum dots -: art. no. 226404

In lateral quantum dots, the combined effect of both Dresselhaus and Bychkov-Rashba spin-orbit coupling is equivalent to an effective magnetic field +/- B-SO which has the opposite sign for s(z)=+/- 1/2 spin electrons. When the external magnetic field is perpendicular to the planar structure, the field B-SO generates an additional splitting for electron states as compared to the spin splitting in the in-plane field orientation. The anisotropy of spin splitting has been measured and then analyzed in terms of spin-orbit coupling in several AlGaAs/GaAs quantum dots by means of resonant tunneling spectroscopy. From the measured values and sign of the anisotropy we are able to determine the dominating spin-orbit coupling mechanism.