Premium
Pulse Propagation and Carrier Kinetics in Laser Excited Semiconductors
Author(s) -
Schäfer W.,
Henneberger K.
Publication year - 1990
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/pssb.2221590107
Subject(s) - dephasing , physics , polarization (electrochemistry) , phonon , anisotropy , condensed matter physics , coulomb , excited state , laser , ultrashort pulse , semiconductor , pulse (music) , computational physics , atomic physics , optics , chemistry , quantum mechanics , electron , detector
Propagation of an intense ultrafast pulse (100 fs) of Gaussian shape with its central frequency above band gap in a GaAs halfspace is investigated theoretically. Nonequilibrium occupation of one particle states, memory effects in the polarization, Coulomb interaction, LO‐phonon Scattering, and spatial inhomogeneities, i. e. the deformation of the pulse shape are taken into account in a strict microscopic approach. The numerical analysis allows to follow the various mechanisms involved on a fs‐time scale, e. g. (1) saturation, spectral hole burning, and relaxation of the one particle distribution, (2) memory effects, dephasing processes, and Coulomb‐enhancement of the polarization and (3) the interplay between that during pulse propagation. The resulting behaviour cannot be simulated by phenomenologically introduced dampings and/or relaxations, thus underlining the importance of accounting for the above mentioned effects in a microscopic way.