Field-induced decoupling of quantized levels and blue shift of absorption edge in a potential inserted quantum well structure

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Abstract
The electric field induced localization and decoupling of quantized levels (FILD) in double quantum wells is studied both theoretically and experimentally and is shown to result in a novel blue shift of optical absorption peaks. The absorption edge of doubly coupled 54 Å GaAs wells separated by a 5.7 Å AlAs inserted barrier is found to shift by 8 meV toward the higher energy under a moderate field (>30 kV/cm). Considering the field-induced variation of quantized levels and excitonic effect, the observed shifts of most peaks are well explained by the simple effective mass theory. Device applications of this novel electro-optic effect (FILD) are also discussed.