The physical processes in modulation spectroscopy of single modulation doped heterojunctions and δ-doped structures were discussed. Different spectral line shapes due to the modulation of electron subband filling and band renormalization induced Stark effect (or quantum confined Franz–Keldysh effect) [Miller et al., Phys. Rev. B 32, 1043 (1985)] were obtained based on self-consistent electronic structure and corresponding wave function calculations.
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Y. S. Tang (1992) studied this question.
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