Optical Absorption of Blased Semiconductor Superlattices.

摘要

We report the first experiment which relates electronic transport and intraband optical absorption in a biased superlattice. Wannier Stark ladders far in the continuum and strongly coupled by Zener resonances are observed in an n- type GaAs/AlGaAs superlattice using infrared spectroscopy. Additional transport measurements reveal the formatilon of electric-field domains with electrons tunneling resonantly to the next-nearest superlattice period. A theoretical description of the optical data is presented and we are able to reproduce most of the important features in the experimental traces.