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Relaxation Dynamics of Electron–Hole Pairs Studied by Spatiotemporal Pump and Probe Experiments
Author(s) -
Grosse S.,
Arnold R.,
von Plessen G.,
Koch M.,
Feldmann J.,
Axt V. M.,
Kuhn T.,
Rettig R.,
Stolz W.
Publication year - 1997
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 - 10.1002/1521-3951(199711)204:1<147::aid-pssb147>3.0.co;2-v
Subject(s) - ambipolar diffusion , exciton , relaxation (psychology) , excited state , electron , excitation , thermal diffusivity , diffusion , monte carlo method , atomic physics , molecular physics , physics , condensed matter physics , materials science , thermodynamics , quantum mechanics , psychology , social psychology , statistics , mathematics
The temporal evolution of the ambipolar diffusivity of optically excited electron–hole pairs is investigated for a strained quantum well structure by temporally and spatially resolved pump and probe experiments. Dependent on the excitation conditions the diffusivity transients reflect the cooling and heating processes of excitons as well as the formation dynamics of excitons out of free electron–hole pairs within less than 10 ps. Diffusivity transients obtained by Monte Carlo simulations of a simplified excitonic Boltzmann equation display all features of the experimental curves and support our interpretation of the lateral propagation dynamics in terms of formation, cooling and heating of excitons.