When an exciton is bound on an isoelectronic centre, one particle (electron or hole) may be severely localised on the centre. In this paper attention is drawn to the importance of the lattice relaxations stimulated by this localised charge density. Two examples are discussed in detail for centres where the exciton binding is produced primarily by the relaxation. It is shown that Jahn-Teller theory applied to the tightly bound particle allows a very precise understanding of the effects of external perturbations on the bound exciton.
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Gordon Davies (1994) studied this question.
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