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JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS
Volume 41, Issue 6A, Pages 3766-3770Publisher
JAPAN SOC APPLIED PHYSICS
DOI: 10.1143/JJAP.41.3766
Keywords
quantum dot superlattices; lateral coupling; time-resolved photoluminescence; photoluminescence excitation
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We investigate, by photoluminescence excitation (PLE) measurements, the modification of density of states and exciton dynamics in a high-density ordered In0.4Ga0.6As/GaAs(311)B quantum dot (QD) array. It was observed that the PLE spectrum exhibited some remarkable features that were completely different from those found in isolated or weakly coupled QD arrays. The increase in exciton coherence length by strong lateral coupling is responsible for the change of the PLE spectrum. In addition, the effect of exciton-phonon scattering on exciton dynamics was studied by temperature-dependent time-resolved photoluminescence (TRPL) measurements. It was found that the exciton lifetimes near the mobility edge were significantly modified with increasing exciton-phonon scattering, leading to the broadening of the mobility edge.
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