Quantum Coherence of Continuum States in the Valence Band of GaAs Quantum Wells | Zendy

T. Dekorsy | Zendy; A. M. T. Kim | Zendy; G. C. Cho | Zendy; S. Hunsche | Zendy; H. J. Bakker | Zendy; H. Kurz | Zendy; S. L. Chuang | Zendy; K. Köhler | Zendy

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Quantum Coherence of Continuum States in the Valence Band of GaAs Quantum Wells

Author(s) -

T. Dekorsy,

A. M. T. Kim,

G. C. Cho,

S. Hunsche,

H. J. Bakker,

H. Kurz,

S. L. Chuang,

K. Köhler

Publication year - 1996

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.77.3045

Subject(s) - quantum beats , physics , quantum well , excitation , atomic physics , coherence (philosophical gambling strategy) , valence (chemistry) , exciton , femtosecond , condensed matter physics , optics , quantum mechanics , laser

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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