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Precise absolute far-infra-red magneto-transmission experiments have beenperformed in magnetic fields up to 33 T on a series of single GaAs quantumwells doped at different levels. The transmission spectra have been simulatedwith a multilayer dielectric model. The imaginary part of the optical responsefunction which reveals new singular features related to the electron-phononinteractions has been extracted. In addition to the expected polaronic effectsdue to the longitudinal optical (LO) phonon of GaAs, a new kind of carrierconcentration dependent interaction with interface phonons is observed. Asimple physical model is used to try to quantify these interactions and exploretheir origin.

Measurement of the infrared transmission through a single doped GaAs quantum well in an external magnetic field: Evidence for polaron effects