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Spin-orbit coupling and anisotropy of spin splitting in quantum dots

J. Konemann·R. J. Haug·D. K. Maude·V. I. Fal'ko·B. L. Altshuler
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Abstract

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 resonanat tunneling spectroscopy. From the measured values and sign of the anisotropy we are able to determine the dominating spin-orbit coupling mechanism.

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J. Konemann, R. J. Haug, D. K. Maude, V. I. Fal'ko, B. L. Altshuler. 2004-09-02. Spin-orbit coupling and anisotropy of spin splitting in quantum dots. https://doi.org/10.1103/physrevlett.94.226404

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