Wavelength Selective Charge Storage in self-assembled InGaAs-GaAs Quantum Dots

Abstract

We present the first demonstration of spectrally selective charge storage in self-assembled quantum dots that utilizes optical charge generation and readout of the stored charge distribution. Resonant optical excitation charges only a sub-ensemble of the inhomogeneous broadened dots. The optical readout process directly recovers the spectral distribution of stored charges. Wavelength selectivity is demonstrated in a two-color experiment exhibiting charge storage in two independent QD sub-ensembles. Resonant charge storage is observed at least up to 85K depending on excitation energy. Lack of time evolution of the spectral emission indicates charge storage times Δt much longer than 25μs.

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Correspondence to M. Kroutvar.

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Kroutvar, M., Ducommun, Y., Finley, J.J. et al. Wavelength Selective Charge Storage in self-assembled InGaAs-GaAs Quantum Dots. MRS Online Proceedings Library 737, 63 (2002). https://doi.org/10.1557/PROC-737-E6.3

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