Combined optical-microwave study of electron-exciton dynamic processes in undoped GaAs/AlGaAs quantum wells

B. M. Ashkinadze, L. Iomin, M. Kozhevnikov, E. Cohen, A. Ron, L. N. Pfeiffer

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

Microwave radiation (36 GHz) absorption by photogenerated electrons is combined with photoluminescence (PL) and its excitation (PLE) spectra in order to study electron-exciton dynamics under low photoexcitation intensity in undoped GaAs/AlGaAs quantum wells. The excitation spectra of the photoinduced microwave absorption (PMA) and the PLE spectra are modified with increasing the lattice temperature from 2 up to 80 K. The observed spectral variations are analyzed using a rate equations model that is based on the main generation-recombination and dissociation processes governing the electron and exciton dynamics. We find that the temperature dependence of the PMA excitation spectrum can be well accounted for by assuming both thermal and non-thermal, Auger-like exciton dissociation mechanisms. The model fitting yields an estimate of the rate coefficients for the exciton formation and dissociation processes.

Original languageEnglish (US)
Pages (from-to)107-111
Number of pages5
JournalPhysica Status Solidi (A) Applied Research
Volume178
Issue number1
DOIs
StatePublished - Mar 2000
Externally publishedYes
EventOptics of Excitons in Confined Systems (OECS-6) - Ascona, Switz
Duration: Aug 30 1999Sep 2 1999

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint

Dive into the research topics of 'Combined optical-microwave study of electron-exciton dynamic processes in undoped GaAs/AlGaAs quantum wells'. Together they form a unique fingerprint.

Cite this