Coherent dynamics of excitons in single and multiple quantum well structures

J. Kuhl, M. Huebner, T. Stroucken, B. Grote, A. Knorr, S. W. Koch, R. Hey, K. Ploog

Research output: Contribution to conferencePaper

Abstract

Four wave mixing degeneration experiments with circularly polarized pulses of 770 fs on single quantum wells (SQW) and multiple QW Bragg structures were performed. The QWs were separated by Al0.3Ga0.7As barriers. In high quality SQWs, radiative recombination yielded an important contribution to the excitonic dephasing and radiative lifetime of coherent excitons was 5 ps. Interwell exciton/exciton coupling mediated by transverse photon exchange existed in MQW Bragg structures. The radiative coupling depended on the number of QWs N, their spacing d, and the direction of the excitation beam. The radiative interwell coupling was a low excitation phenomenon and disappeared at higher excitation intensities.

Original languageEnglish (US)
Number of pages1
StatePublished - Jan 1 1997
EventProceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim - Chiba, Jpn
Duration: Jul 14 1997Jul 18 1997

Other

OtherProceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim
CityChiba, Jpn
Period7/14/977/18/97

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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    Kuhl, J., Huebner, M., Stroucken, T., Grote, B., Knorr, A., Koch, S. W., Hey, R., & Ploog, K. (1997). Coherent dynamics of excitons in single and multiple quantum well structures. Paper presented at Proceedings of the 1997 Pacific Rim Conference on Lasers and Electro-Optics, CLEO/Pacific Rim, Chiba, Jpn, .