Development of New Quantum Structure by Long-Range Ordered Semiconductor Superlattice Thin Films

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We have performed the material research of the natural superlattice super-thin film from two view points ; (1)physics and (2)preparation of the new semiconductor quantum structure material, in order to create new quantum structure materials which semiconductor natural superlattice super-thin film was used for. Relations between order parameter and the band-gap fluctuation of the natural superlattice thin film were cleared, and it succeeded in the control of the fluctuations that result. It became clear that injected or excited carriers in the natural superlattice thin film have quantum behavior from the ultra-fast spectroscopy and the electronic transport ptoperty by Time-of Flight measurements. On the other hand, development of the crystal growth technology controlled in atom scale was indispensable, and we built the system which therefore measured a RDS(reflectance-difference spectroscopy)signal with RHEED during the crystal growth in real time to grow new natural superlattice quantum structure materials. It succeeded in observing atomic behavior in the crystal growth front during the atomic layer growth by using this technology with molecular beam epitaxy.