Abstract
The Wannier-Stark localization of asymmetric double well superlattices (ADW-SLs) has been investigated by low-temperature photocurrent spectroscopy. The ADW-SLs consist of arrays of asymmetric double quantum wells formed by coupling of two different size wells. Reflecting the difference in the eigenenergies of the two wells, the occurrence of the Stark-ladder transitions is, in principle, characterized by the superposition of two fan diagrams. Hence, four ±1st-order spatially indirect transitions are expected to exist. However, they are experimentally observed only partially. This selectivity is interpreted by considering the coupling pattern between two wells in the ADW-SLs. The control of the coupling pattern is a new concept to design SL structures and its Wannier-Stark localization.
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