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 language | English |
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Article number | 141917 |
Journal | Applied Physics Letters |
Volume | 91 |
Issue number | 14 |
DOIs | |
Publication status | Published - 2007 |
Externally published | Yes |
ASJC Scopus subject areas
- Physics and Astronomy (miscellaneous)