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Spatio-temporal dynamics of quantum-well excitons
Zhao, Hui Dal Don, B. Moehl, Sebastian Kalt, Heinz Ohkawa, K. Hommel, D.
Zhao, Hui
Dal Don, B.
Moehl, Sebastian
Kalt, Heinz
Ohkawa, K.
Hommel, D.
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Abstract
We investigate the lateral transport of excitons in ZnSe quantum wells by using time-resolved micro-photoluminescence enhanced by the introduction of a solid immersion lens. The spatial and temporal resolutions are 200 nm and 5 ps, respectively. Strong deviation from classical diffusion is observed up to 400 ps. This feature is attributed to the hot-exciton effects, consistent with previous experiments under cw excitation. The coupled transport-relaxation process of hot excitons is modelled by Monte Carlo simulation. We prove that two basic assumptions typically accepted in photoluminescence investigations on excitonic transport, namely (i) the classical diffusion model as well as (ii) the equivalence between the temporal and spatial evolution of the exciton population and of the measured photoluminescence, are not valid for low-temperature experiments.
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Date
2003-01
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American Physical Society
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Strongly Correlated Electrons, Mesoscale and Nanoscale Physics
Citation
Hui Zhao, B. Dal Don, S. Moehl, H. Kalt, K. Ohkawa and D. Hommel, Spatio-temporal dynamics of quantum-well excitons, Physical Review B, 67 035306 (2003). http://link.aps.org/doi/10.1103/PhysRevB.67.035306