Physics – Condensed Matter – Materials Science
Scientific paper
2008-05-15
Physics
Condensed Matter
Materials Science
32 pages, 8 figures, 3 tables. Submitted to Physical Review B on April 18th 2008
Scientific paper
The contribution of the fundamental gap E_ as well as those of the E_ + Delta(so) and E+ transitions to the dielectric function of GaAs1-xNx alloys near the band edge were determined from variable-angle spectroscopic ellipsometry and modulated photoreflectance spectroscopy analyses. The oscillator strength of the E_ optical transition increases weakly with nitrogen incorporation. The two experimental techniques independently reveal that not only the oscillator strength of the E+ transition but also that of E_ + Delta(so) become larger compared to that of the fundamental gap as the N content increases. Since the same conduction band is involved in both the E_ transition and its split-off replica, these results reveal that adding nitrogen in GaAs1-xNx alloys affects not only the conduction but also the valence bands.
Beaudry Normand J.
Desjardins Patrick
Larouche Stéphane
Leonelli Richard
Martinu Ludvik
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