Micro-photoluminescence excitation spectroscopy on asymmetric absorption line shapes of weakly localized excitons in a quantum well

Shun Maruyama, Toshiyuki Ihara, Hirotake Itoh, Masahiro Yoshita, Hidefumi Akiyama, Loren N. Pfeiffer, Ken W. West

Research output: Contribution to journalArticlepeer-review

Abstract

Micro-photoluminescence (PL) and micro-PL excitation (PLE) spectra were measured systematically in a 5 nm GaAs/AlAs single quantum well (QW) to investigate the predicted effect of asymmetric exciton absorption line shapes having high-energy tails due to weak localization of exciton center-of-mass motion by interface roughness. We found a characteristic change in the asymmetric shapes as the QW-interface coverage by monolayer terraces varied. Via spectral fitting using a reported model, we quantitatively obtained a localization length varying between 4-15 nm, and verified the validity as well as limitation of this model.

Original languageEnglish
Pages (from-to)114-117
Number of pages4
JournalSolid State Communications
Volume147
Issue number3-4
DOIs
Publication statusPublished - 2008 Jul 1
Externally publishedYes

Keywords

  • A. Quantum wells
  • D. Exciton localization
  • D. Optical properties
  • E. Photoluminescence

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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