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Zeeman splitting of the ground state of single impurities in the quantum well of a resonant tunneling heterostructure is reported. We determine the absolute magnitude of the effective magnetic spin splitting factor g_⊥* for a single impurity in a 44 Al0.27Ga0.73As/GaAs/Al0.27Ga0.73As quantum well to be 0.28 ± 0.02. This system also allows for independent measurement of the electron tunneling rates through the two potential barriers and estimation of the occupation probability of the impurity state in the quantum well.
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Deshpande et al. (1996) studied this question.
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