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Spectroscopic Imaging in a Narrow GaAs Quantum Well
Author(s) -
Wu Qiang,
Grober R.D.,
Gammon D.,
Katzer D.S
Publication year - 2000
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 - 10.1002/1521-3951(200009)221:1<505::aid-pssb505>3.0.co;2-y
Subject(s) - biexciton , exciton , excitation , quantum dot , atomic physics , quantum well , resonance (particle physics) , quantum , materials science , physics , molecular physics , condensed matter physics , optoelectronics , optics , laser , quantum mechanics
Spectroscopic images from a narrow GaAs/AlGaAs quantum well obtained with a microscope based on a solid immersion lens are presented. We show that the luminescing excitons are localized in quantum dot‐like states but that they share a common excitation resonance. Excitation images obtained at this energy are extended in the plane of the quantum well. With increasing pump power density the exciton intensities saturate and biexciton lines are observed. Further increasing the pump power leads to the growth of a broad spectral feature that is ascribed to an electron–hole plasma.