Excitonic signatures in the photoluminescence and terahertz absorption of a GaAs/AlxGa1-xAs multiple quantum well

I. Galbraith, R. Chari, S. Pellegrini, P. J. Phillips, C. J. Dent, A. F G Van Der Meer, D. G. Clarke, A. K. Kar, G. S. Buller, C. R. Pidgeon, B. N. Murdin, J. Allam, G. Strasser

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29 Citations (Scopus)

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 1s 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-1p 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). ©2005 The American Physical Society.

Original languageEnglish
Pages (from-to)1-4
Number of pages4
JournalPhysical Review B: Condensed Matter and Materials Physics
Volume71
Issue number7
DOIs
Publication statusPublished - Feb 2005

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