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Phys. Rev. Lett. 78, 2228 - 2231 (1997)

Resonant Femtosecond Emission from Quantum Well Excitons: The Role of Rayleigh Scattering and Luminescence

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S. Haacke1, R. A. Taylor2, R. Zimmermann3, I. Bar-Joseph4, and B. Deveaud1
1Institute for Micro- and Optoelectronics, Swiss Federal Institute of Technology, CH-1015 Lausanne, Switzerland
2Physics Department, Clarendon Laboratory, University of Oxford, Oxford OX1 3PU, United Kingdom
3Institut für Physik, Humboldt-Universität zu Berlin, 10117 Berlin, Germany
4Department of Physics, Weizmann Institute of Science, Rehovot 76100, Israel

Received 9 December 1996

We study the ultrafast properties of secondary radiation of semiconductor quantum wells under resonant excitation. We show that the exciton density dependence allows one to identify the origin of secondary radiation. At high exciton densities, the emission is due to incoherent luminescence with a rise time determined by exciton-exciton scattering. For low densities, when the distance between excitons is much larger than their diameter, the temporal shape is independent of density and rises quadratically, in excellent agreement with recent theories for resonant Rayleigh scattering.


©1997 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.78.2228
DOI: 10.1103/PhysRevLett.78.2228
PACS: 78.35.+c, 71.35.-y, 78.47.+p, 78.66.-w

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