Cyclotron resonance and magnetophonon resonance studies have been made of superlattices grown from thin layers of Ga.47In.53As and InP, which exhibit two dimensional behaviour at temperatures up to 250K. The electron effective mass varies with layer thickness in reasonable agreement with the calculated non-parabolicity. The LO phonon energies are calculated from magnetophonon oscillations and mass values obtained from cyclotron resonance. A strong series of oscillations results from the dominant 'GaAs-like' mode in GaInAs. A second, weaker series corresponds to the energy of the InP LO phonon. This is evidence for a long range phonon interaction, with the field of the phonons extending into the GaInAs to cause a significant coupling with the electrons bound in the quantum wells.
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