Abstract
We report theoretical studies of the spin splitting caused by inversion asymmetries in quantum ring-shaped self-assembled quantum dots with circular cross sections. We analyze the conduction band and the spinsplitting electronic energy dispersions of the system in the presence of both bulk Dresselhaus and structural Rashba inversion asymmetries as a function of quantum ring geometrical parameters. We have explored the interplay effects between the circular confinement symmetry and the magnitude of the spin-orbit constants for the dot material. We describe universal conditions to operate a spin-field-effect transistor based on quantum rings with identical linear Dresselhaus and Rashba spin-orbit coupling interactions. The results show to be sensitive to both the quantum ring radii and the dot thickness.
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