Characterizing intra-exciton Coulomb scattering in terahertz excitations

S. Zybell, J. Bhattacharyya, S. Winnerl, F. Eßer, M. Helm, H. Schneider, L. Schneebeli, C. N. Böttge, M. Kira, S. W. Koch, A. M. Andrews, G. Strasser

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Abstract

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.

Original languageEnglish (US)
Article number201109
JournalApplied Physics Letters
Volume105
Issue number20
DOIs
StatePublished - Nov 17 2014

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    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. (2014). Characterizing intra-exciton Coulomb scattering in terahertz excitations. Applied Physics Letters, 105(20), [201109]. https://doi.org/10.1063/1.4902431