Excitonic Photoluminescence in Semiconductor Quantum Wells: Plasma versus Excitons

Sangam Chatterjee, C. Ell, S. Mosor, G. Khitrova, H. M. Gibbs, W. Hoyer, M. Kira, S. W. Koch, J. P. Prineas, H. Stolz

Type: Article

Publication Date: 2004-02-13

Citations: 128

DOI: https://doi.org/10.1103/physrevlett.92.067402

Abstract

Time-resolved photoluminescence spectra after nonresonant excitation show a distinct 1s resonance, independent of the existence of bound excitons. A microscopic analysis identifies exciton and electron-hole plasma contributions. For low temperatures and low densities, the excitonic emission is extremely sensitive to details of the electron-hole-pair population making it possible to identify even minute fractions of optically active excitons.

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