Tunable local polariton modes in semiconductors

Details Tunable local polariton modes in semiconductors Tunable local polariton modes in semiconductors

2001-02-22

arxiv.org/abs/cond-mat/0102392v2

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 3 figures

Scientific paper

10.1103/PhysRevB.64.115203

We study the local states within the polariton bandgap that arise due to deep defect centers with strong electron-phonon coupling. Electron transitions involving deep levels may result in alteration of local elastic constants. In this case, substantial reversible transformations of the impurity polariton density of states occur, which include the appearance/disappearance of the polariton impurity band, its shift and/or the modification of its shape. These changes can be induced by thermo- and photo-excitation of the localized electron states or by trapping of injected charge carriers. We develop a simple model, which is applied to the $O_P$ center in $GaP$. Further possible experimental realizations of the effect are discussed.

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