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Abstract
AbstractThe results of selective magneto‐luminescence measurements of donoacceptor pairs in n‐type GaAs are discussed. The experimental data are compared with the calculated energy levels of a hydrogen‐like atom in a magnetic field, enabling us to identify a large number of high angular momentum states of the hydrogen‐like impurity in magnetic fields. It is shown that in addition to intra‐donor transitions, the spin‐flip excitations of donor–acceptor pairs involving heavy and light holes can be observed, yielding information about g‐factors for heavy and light holes. For the pairs with separations smaller than the donor Bohr radius, a strong modification of the SPL spectrum is observed. This effect is discussed in terms of modification of the acceptor ground state induced by the interaction with a neighbouring donor centre.
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