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2001
Journal Article
Titel
Fano resonances in semiconductor superlattices
Alternative
Fanoresonanz in Halbleiterübergittern
Abstract
We use semiconductor superlattices as a model system for the investigation of Fano resonances. In absorption the excitonic transitions of the Wannier-Stark ladder show the typical asymmetric line shape due to coupling to the continuum of lower-lying transitions. The unique feature of these Fano resonances is that they allow to continuously tune the key parameter - the coupling strength Gamma between the discrete state and the degenerate continuum - by varying the bias voltage. Using this feature, we directly show that the Fano coupling leads to a fast polarization decay. We also investigate the dependence of the Fano parameters on the structure of the superlattice and compare with an extensive theoretical model of the resonances.
Author(s)