INVERSE PARABOLIC QUANTUM-WELL AND ITS QUANTUM-CONFINED STARK-EFFECT

An inverse parabolic quantum well was successfully grown by molecular- beam epitaxy using a digital compositional grading superlattice compos ed of Al0.36Ga0.64As/GaAs. The photoluminescence and photocurrent meas urements for this structure gave a good agreement between experimental and theoretical results. Large Stark shift and amplitude reduction of 1e-1hh exciton resonance under applied electric field were found in t he photoluminescence spectra, which are substantially larger than the conventional square quantum well. These properties benefited from the concept of local-to-global state transitions.