Acoustically driven storage of light in a quantum well

Details Acoustically driven storage of light in a quantum well Acoustically driven storage of light in a quantum well

1997-04-03

arxiv.org/abs/cond-mat/9704029v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 PostScript figures included, Physical Review Letters, in press

Scientific paper

10.1103/PhysRevLett.78.4099

The strong piezoelectric fields accompanying a surface acoustic wave on a semiconductor quantum well structure are employed to dissociate optically generated excitons and efficiently trap the created electron hole pairs in the moving lateral potential superlattice of the sound wave. The resulting spatial separation of the photogenerated ambipolar charges leads to an increase of the radiative lifetime by orders of magnitude as compared to the unperturbed excitons. External and deliberate screening of the lateral piezoelectric fields triggers radiative recombination after very long storage times at a remote location on the sample.

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