Abstract
We report the observation of electric-field domain formation in an asymmetric double-quantum-well GaAs/AlAs superlattice. Photoluminescence (PL) spectra exhibit several branches with increasing bias voltage. These steeply red-shifted PL branches can be attributed to Stark-ladder transitions between the heavy hole ground state in the narrow quantum well and the electron ground state in the wide quantum well in the high-field domain. According to our calculations, electrons and holes in the high-field domain are separated into different quantum wells, resulting in a large reduction of the radiative recombination energy with increasing electric field. Each PL branch most likely corresponds to the moving of the domain boundary.
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