A high band-gap material surrounded by two short-period superlattices of lower band gap is proposed for carrier confinement to the barrier. The combined structure behaves as a Fabry–Perot cavity for carriers as long as coherence of the carrier wave function is maintained. Since Bragg confinement and creation of a mini-gap energy state is sensitive to the value of the carrier effective mass, the system is also an effective mass filter for light holes.
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Lenz et al. (1990) studied this question.
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