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Dephasing of Heavy–Light Hole Quantum Beats by Coulomb Quantum Kinetics
Author(s) -
Mieck B.,
Haug H.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199906)213:2<397::aid-pssb397>3.0.co;2-x
Subject(s) - quantum beats , dephasing , physics , excited state , atomic physics , coulomb , quantum , valence (chemistry) , femtosecond , excitation , quantum mechanics , laser , electron
We investigate the dephasing of quantum beats between the continuum states of the heavy–light hole valence bands in GaAs, excited by a coherent femtosecond laser pulse. A Coulomb quantum kinetic calculation is used to determine the quantum beats for a coherent differential transmission experiment. Our theory is based on the full two‐time‐dependent RPA‐screened Coulomb potential which is calculated self‐consistently and evolves from a bare potential to the well‐known dynamically screened RPA potential for long times. Our calculation shows that strongly damped quantum beats between the continuum states of the heavy–light hole valence bands still persist at higher excitation densities of 10 17 to 10 18 cm —3 .