Abstract
The magnetoexciton polaron (MP) is investigated theoretically in a diluted magneticsemiconductor quantum dot (QD), with the Coulomb interaction and the sp–dexchange interaction included. The MP energy decreases rapidly with increasingmagnetic field at low magnetic field and saturates at high magnetic field for smallQDs, and the dependences of the MP energy on magnetic field are quite differentfor different QD radii due to the different carrier-induced magnetic fieldsBMP.The competition between the sp–d exchange interaction and the band gapshrinkage results in there being a maximum exhibited by the MP energy withincreasing temperature. Our numerical results are in good agreement withexperiment (Maksimov A A, Bacher G, MacDonald A, Kulakovskii V D, ForchelA, Becker C R, Landwehr G and Molenkamp L W 2000 Phys. Rev. B 62 R7767).
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