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Spatially Resolved Photoluminescence in Quantum Wells with Surface Acoustic Waves
Author(s) -
Santos P. V.,
Ramsteiner M.,
Hey R.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199909)215:1<253::aid-pssb253>3.0.co;2-s
Subject(s) - photoluminescence , wavelength , quantum well , surface acoustic wave , standing wave , piezoelectricity , acoustic wave , electron , modulation (music) , materials science , physics , condensed matter physics , optics , acoustics , laser , quantum mechanics
The interaction between a standing surface acoustic wave (SAW) and photogenerated carriers in GaAs/Al 0.3 Ga 0.7 As quantum well (QW) structures is investigated using spatially resolved micro‐photoluminescence (μ‐PL). Under a standing SAW, the μ‐PL intensity becomes spatially modulated with a period equal to half of the SAW wavelength. The modulation is attributed to (i) the lateral separation of electron–hole pairs by the standing wave potential, at times when the piezoelectric potential is large, and (ii) to the preferential recombination of the carriers close to the potential nodes, when the standing wave potential vanishes.