Collective radiative decay of light- and heavy-hole exciton polaritons in multiple-quantum-well structures

D. Ammerlahn, J. Kuhl, B. Grote, S. W. Koch, G. Khitrova, H. Gibbs

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Time- and spectrally resolved reflectivity measurements on multiple-quantum-well structures excited by ultrashort laser pulses are presented. In Bragg structures, where the interwell distance amounts to half the optical wavelength at the exciton resonance, superradiant coupling of the polarization dynamics within different quantum wells leads to an enhancement of the reflectivity strength and linewidth. We show that the superradiance is not limited to the heavy-hole exciton but can be observed even on excited and light-hole exciton states as well as on correlated electron-hole pair states. These coupling effects grow with the number of quantum wells. For our samples containing 60 and 30 quantum wells, pronounced superradiant enhanced reflectivity is present even at high excitation intensities and high temperatures, showing the insensitivity of radiative coupling with respect to incoherent scattering processes. Our findings are in good agreement with solutions of the semiconductor Maxwell-Bloch equations.

Original languageEnglish (US)
Pages (from-to)7350-7356
Number of pages7
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume62
Issue number11
DOIs
StatePublished - Sep 15 2000

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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