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Calculated conduction band edge of the heterostructure vs position from the surface at various . (a) , (b) , (c) , and (d) .
ER spectra of the heterostructure at various , where the numbers are indexed to the extrema of FKOs.
Strength of the electric field in the barrier vs . The line is the least squares fit to the data between and . The slope yields the width , which is the distance between the surface and the 2DEG layer.
Amplitude of the -exciton transition of the GaN vs . The amplitude was obtained by Lorentzian fitting of ER spectra in Fig. 2.
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