Collective intersubband resonance of inversion electrons in gated AlAs-GaAs single heterojunctions is studied with Fourier-transform spectroscopy using grating coupler techniques. Large grating periods are chosen to test the interface potential at nearly zero wave-vector transfer q parallel to the sample plane. With highly efficient grating couplers up to three intersubband transitions are excited simultaneously. A coupling of the collective intersubband resonance to confined AlAs optical phonons is observed.
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Batke et al. (1989) studied this question.
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