Publikation: Quantum coherence of continuum states in the valence band of GaAs quantum wells
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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.
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DEKORSY, Thomas, A. M. T. KIM, Gyu Cheon CHO, Stefan HUNSCHE, Huib J. BAKKER, Heinrich KURZ, Shun Lien CHUANG, Klaus KÖHLER, 1996. Quantum coherence of continuum states in the valence band of GaAs quantum wells. In: Physical Review Letters. 1996, 77(14), pp. 3045-3048. Available under: doi: 10.1103/PhysRevLett.77.3045BibTex
@article{Dekorsy1996Quant-5291, year={1996}, doi={10.1103/PhysRevLett.77.3045}, title={Quantum coherence of continuum states in the valence band of GaAs quantum wells}, number={14}, volume={77}, journal={Physical Review Letters}, pages={3045--3048}, author={Dekorsy, Thomas and Kim, A. M. T. and Cho, Gyu Cheon and Hunsche, Stefan and Bakker, Huib J. and Kurz, Heinrich and Chuang, Shun Lien and Köhler, Klaus} }
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