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We theoretically investigate the Rashba and Dresselhaus spin-orbit interaction in AlAs/GaAs/Al0.3Ga0.7As/AlAs step-quantum wells. The ratio of Rashba and Dresselhaus spin splitting can be effectively manipulated by the well width and step width in the absence of electric field and magnetic field. When the well width of the step-quantum well is wider than 10 nm, the total spin splitting, which contains...
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