Characterizing intra-exciton Coulomb scattering in terahertz excitations
Characterizing intra-exciton Coulomb scattering in terahertz excitations
Zybell, S.; Bhattacharyya, J.; Winnerl, S.; Eßer, F.; Helm, M.; Schneider, H.; Schneebeli, L.; Böttge, C. N.; Kira, M.; Koch, S. W.; Andrews, A. M.; Strasser, G.
An intense terahertz field is applied to excite semiconductor quantum wells yielding strong non-equilibrium exciton distributions. Even though the relaxation channels involve a complicated quantum kinetics of Coulomb and phonon effects, distinct relaxation signatures of Coulomb scattering are identified within time-resolved photoluminescence by comparing the experiment with a reduced model that contains all relevant microscopic processes. The analysis uncovers a unique time scale for the Coulomb scattering directly from experiments and reveals the influence of phonon relaxation as well as radiative decay.
Keywords: Exciton dynamics; GaAs quantum well; terahertz; intra-exciton transition; Coulomb scattering
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- Radiation Source ELBE DOI: 10.17815/jlsrf-2-58
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- DOI: 10.17815/jlsrf-2-58 is cited by this (Id 21184) publication
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Applied Physics Letters 105(2014), 201109
DOI: 10.1063/1.4902431
Cited 3 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-21184