Spatiotemporal dynamics of quantum-well excitons

Hui Zhao, B. Dal Don, S. Moehl, H. Kalt, Kazuhiro Ohkawa, D. Hommel

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

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 modeled by Monte Carlo simulation. We prove that the 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.

Original languageEnglish (US)
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume67
Issue number3
DOIs
StatePublished - Jan 1 2003

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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