Excitonic wave packets observed in space- and time-resolved pump and probe experiments

• Published in: Solid state communications 1999-01, Vol.109 (5), p.317-322
• Main Authors: Otremba, R., Grosse, S., Koch, M., Feldmann, J., Axt, V.M., Kuhn, T., Stolz, W.
• Format: Article
• Language: English
• Subjects: A. Quantum wells; Condensed matter: electronic structure, electrical, magnetic, and optical properties; D. Optical properties; E. Non-linear optics; Electron states and collective excitations in multilayers, quantum wells, mesoscopic, and nanoscale systems; Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems; Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures; Exact sciences and technology; Iii-v semiconductors; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of specific thin films; Physics; Time-resolved optical spectroscopies and other ultrafast optical measurements in condensed matter
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/S0038-1098(98)00548-1

We investigate the coherent time regime in space- and time-resolved pump and probe experiments on a symmetrically strained InGaAs/GaAsP multiple quantum well. The spatial width of the transmission profiles shows a modulation which reflects the dynamics of an excitonic wave packet. This spatio–temporal beating originates from the combined action of various signal components which are detected simultaneously because of the collinearity of our experiment. The experimental results are in qualitative agreement with calculations obtained with a simplified model on the Hartree–Fock level.