Abstract
Counteracting electron-phonon and electron-electron interaction in the optical absorption spectra of a quantum well intersubband system can have a significant impact on the line shape and line width of optical transitions at low temperatures. In particular, polaronic repellons can be formed due to an attractive intersubband polaron-polaron interaction. At low temperatures and for properly chosen densities; this effect can lead to a line broadening of the intersubband transition, even in a weak coupling regime.
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