Dimensional oscillation in GaAsAlAs quantum wells by two-dimensional standing surface acoustic waves

Tetsuomi Sogawa, Hideki Gotoh, Yoshiro Hirayama, Paulo V. Santos, Klaus H. Ploog

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

We have used spatially and time-resolved photoluminescence (PL) spectroscopy recorded using a synchronized excitation method in order to investigate the mechanisms for the dynamic PL modulation of GaAsAlAs quantum wells by two-dimensional (2D) standing surface acoustic waves (SAWs). It is clearly demonstrated that a square array of dynamic quantum dots (DQDs) is formed, which oscillates with a repetition interval equal to half of the SAW period. A 2D flatband condition appears between the DQD formations. The spatial modulation of the PL intensity is attributed to exciton migration into the tensile-strained dots created by the strain-induced band-gap modulation.

Original languageEnglish
Article number141917
JournalApplied Physics Letters
Volume91
Issue number14
DOIs
Publication statusPublished - 2007 Oct 11
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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