Excitonic Photoluminescence in Semiconductor Quantum Wells: Plasma versus Excitons
S. Chatterjee, C. Ell, S. Mosor, G. Khitrova, H.M. Gibbs, W. Hoyer, M., Kira, S.W. Koch, J.P. Prineas, H. Stolz
TL;DR
This paper investigates the origins of photoluminescence in semiconductor quantum wells, distinguishing between excitonic and plasma contributions, and provides a phase diagram for exciton populations at low temperatures.
Contribution
It offers a microscopic analysis differentiating excitonic and plasma effects in photoluminescence, and introduces a phase diagram for incoherent excitonic populations.
Findings
Excitonic and plasma contributions can be distinguished in photoluminescence spectra.
Excitonic emission is highly sensitive to small exciton populations at low temperatures.
A phase diagram for incoherent excitonic populations is established.
Abstract
Time-resolved photoluminescence spectra after nonresonant excitation show a distinct 1s resonance, independent of the existence of bound excitons. A microscopic analysis identifies excitonic and electron-hole plasma contributions. For low temperatures and low densities the excitonic emission is extremely sensitive to even minute optically active exciton populations making it possible to extract a phase diagram for incoherent excitonic populations.
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