Abstract
A study of quantum limit cyclotron resonance linewidth has been carried out in n-GaAs and pure Ge. The relaxation time in the quantum limit derived from cyclotron resonance linewidth has been examined for neutral donor scattering in GaAs and for acoustic deformation potential scattering in Ge. Time-resolved far-infrared (513 to 84 μm) laser cyclotron resonance has been performed in pulsed band gap excitation. It is found that (1) The inverse relaxation time for neutral donor scattering is proportional to neutral donor concentration and the reciprocal of the square root of magnetic field, and independent of temperature. (2) The same for acoustic deformation potential scattering is proportional to temperature and the square root of magnetic field.
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