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Excitonic Signatures in the Photoluminescence and Terahertz Absorption of a GaAs/AlxGa1-xAs Multiple Quantum Well

Galbraith, I, Chari, R, Pellegrini, S, Phillips, P J, Dent, C J, van der Meer, A F, Clarke, D G, Kar, A K, Buller, G S, Pidgeon, C R, Murdin, B N, Allam, J and Strasser, G (2005) Excitonic Signatures in the Photoluminescence and Terahertz Absorption of a GaAs/AlxGa1-xAs Multiple Quantum Well Physical Review B, 71 (7). ISSN 1098-0121

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Abstract

Measurements of the THz absorption and the time-resolved photoluminescence have been performed on the same GaAs quantum well sample. The strength of the absorption at the internal 1s-2p exciton transition frequency is used as a measure of the density of excitons in the sample. When the interband pump laser is resonant with the Is exciton frequency, induced absorption at the 1s-2p frequency is clearly seen. If the same density of carriers is created pumping in the continuum, no significant 1s-2p absorption is seen in a time window of 450 ps. Complementary time-resolved photoluminescence experiments, detecting the emission at the exciton energy under the same pump conditions, show the PL intensity in resonant and nonresonant cases to be similar. The counter-intuitive existence of luminescence at the exciton energy simultaneously with the absence of the 1s-2p absorption is consistent with the recent theoretical predictions of Kira et al., Phys. Rev. Lett. 81, 3263 (1998).

Item Type: Article
Additional Information: Published in <i>Physical Review B,</i> Vol. 71, Iss. 7. Copyright 2005 American Physical Society. Click <a href=http://prb.aps.org/>here</a> to access the journal's website.
Divisions: Faculty of Engineering and Physical Sciences > Electronic Engineering > Advanced Technology Institute > Photonics
Faculty of Engineering and Physical Sciences > Physics
Depositing User: Mr Adam Field
Date Deposited: 27 May 2010 14:07
Last Modified: 23 Sep 2013 18:27
URI: http://epubs.surrey.ac.uk/id/eprint/284

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