Fröhlich interaction in two-dimensionalGaAs/AlxGa1−xAssystems

The scattering of carriers by polar optical phonons due to the Fröhlich interaction is studied in undoped $\mathrm{GaAs}/{\mathrm{Al}}_x{\mathrm{Ga}}_{1-x}\mathrm{As}$ quantum wells by tracing the heating of cold carriers in a hot lattice with transient photoluminescence spectra. The Fröhlich interaction proves to be (within an experimental uncertainty of ±50%) independent of the dimensionality of the system, independent of quantum-well thickness, and independent of carrier density.