Spin states and persistent currents in a quantum ring with an embedded magneticimpurity

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Spin states and persistent currents are investigated theoretically in a quantumring with an embedded magnetic ion under a uniform magnetic field includingthe spin–orbit interactions. The magnetic impurity acts as a spin-dependentδ-potential for electrons and results in gaps in the energy spectrum, consequentlysuppressing the oscillation of the persistent currents. The competition betweenthe Zeeman splittings and the s–d exchange interaction leads to a transition ofthe electron ground state in the ring. The interplay between the periodicpotential induced by the Rashba and Dresselhaus spin–orbit interactions and theδ-potential induced by the magnetic impurity leads to significant variation in the energyspectrum, charge density distribution, and persistent currents of electrons in the ring.