We show by means of time-resolved four-wave-mixing experiments that the simultaneous excitation of energetically distinct and inhomogeneously broadened exciton transitions associated with spatially separated quantum-well islands leads to a beating photon echo. This shows that the exciton transitions cannot be described by uncoupled two-level systems. We discuss bleaching, screening, and dipole-dipole interaction as possible coupling mechanisms.

Physical review. B, Condensed matterOct 15, 199338 citations

Quantum beats of excitons in quantum wells

Karl Leo, Ernst Otto Göbel, Theo C. Damen +6 more

May 21, 19900 citations

Conference on Lasers and Electro-Optics

Photon echoes from excitons localized to quantum islands in single quantum well

Yasuyoshi Mitsumori, Atsushi Hasegawa, F. Minami, Masahide Sasaki

Published Jan 1, 2005• 0 citations

Publisher

DOI: 10.1109/iqec.2005.1560970

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Nonlinear optical response and optical coherence time of excitons localized to quantum islands in a

\mathrm{Ga}\mathrm{As}∕\mathrm{Al}\mathrm{Ga}\mathrm{As}

single quantum well are studied by the three-pulse photon echo technique. At low temperature, the optical coherence time is estimated to be

1.8\phantom{\rule{0.3em}{0ex}}\mathrm{ns}

from the decay of the photon echo signal. The decay profile for short time delay shows the strong dependence on the input pulse area of the third pulse. Rabi oscillations are also observed. The oscillations show nonlinear behavior affected by the pre-excited polarization. Such behavior can be qualitatively explained by the local field effect due to the exciton-exciton interaction between the localized excitons.