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Springer series in chemical physics

Heavy-Light Hole Quantum Beats in the Band-to-Band Continuum of Bulk GaAs Studied in 20 fs Pump-Probe Experiments

M. Joschko, Michael Woerner, Thomas Elsaesser, R. Hey, Helmar KOSTIAL, Klaus Ploog

Published Jan 1, 1996• 2 citations
Publisher
DOI
10.1007/978-3-642-80314-7_168

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Quantum beats of heavy and light holes in GaAs quantum wells are investigated in femtosecond time-resolved four-wave mixing and transmission experiments as a function of optical excitation energy. Under nonexcitonic excitation conditions, the four-wave mixing signal disappears due to the immediate loss of the interband coherence of continuum states. In the transmission experiment, the quantum beats are observed up to excess energies of 75 meV above the exciton resonances. The experimental data clearly demonstrate the coherence of continuum states in the valence band. Changes of the beat frequency with the excitation energy are due to the dispersion of the valence bands.