Abstract
In the far-infrared response of dot structures, a shift of the resonance peak of electrons in a dot can be clearly observed under pulsed photoexcitation. The peak shift is interpreted by a potential modulation due to photoexcitation. In a dot array fabricated on a double heterostructure, the potentials of vertically aligned two dots are also modulated. The modulation is different from each other. This potential modulation gives the possibility that the vertical coupling between two dots can be controlled by photoexcitation.
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