Optically Detected Magnetophonon Resonance in GaAs-GaAlAs Heterojunctions
We present an experimental observation of the magnetophonon effect in the frequency dependent conductivity of a GaAl-GaAlAs heterojunction. The cyclotron resonance position and linewidth are found to oscillate as a function of magnetic field and show resonances for ωL.O. ≈ NωC. The resonances grow rapidly with increasing temperature. Good agreement is found with a one-electron theory of the cyclotron resonance absorption spectrum, which demonstrates that the observed oscillations have the same origin as the MPR oscillations in the resistivity.
KeywordsCyclotron Resonance Optic Phonon Landau Level Frequency Dependent Conductivity Cyclotron Resonance Frequency
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