Phys. Rev. Lett. 78, 2228–2231 (1997)Resonant Femtosecond Emission from Quantum Well Excitons: The Role of Rayleigh Scattering and LuminescenceReceived 9 December 1996; published in the issue dated 17 March 1997 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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