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Fano resonances in semiconductor superlattices

Fano-Resonanzen in Halbleiterübergittern


Physical review letters 81 (1998), No.4, pp.874-877 : Ill., Lit.
ISSN: 0031-9007
Journal Article
Fraunhofer IAF ()
III-V Halbleiter; III-V semiconductor; optical measurement; optische Messung; superlattice; Übergitter

We report the first observation of Fano resonances in biased semiconductor superlattices: The excitonic Wannier-Stark ladder transitions show asymmetric absorption due to the coupling to the continua of lower transitions. In contrast to other known examples of Fano resonances, the Fano coupling can be continuously tuned in this system by changing the static field across the superlattice. The line shapes and their coupling dependence are in excellent agreement with theory. We also investigate the dephasing dynamics of the resonances and observe an increase in dephasing with increasing Fano coupling.