Cyclotron resonance and polaron effects in a 2DEG In GaInAs.

Cyclotron resonance results from GaInAs-InP heterojunctions and superlattices and GaInAs-AlInAs heterojunctions in fields up to 18T are reported. For low frequencies, the effective mass is compared with the predictions of k.p. theory, and the resonance linewidth is fitted to finite range scattering theories. At higher frequencies, the linewidth increases dramatically, while the effective mass deviates from its low-frequency value. These effects are attributed to resonant polaron coupling.