Theory of observed cyclotron-resonance-linewidth behavior

Abstract

The quantum-limit cyclotron-resonance linewidth is studied theoretically, assuming electron scattering by acoustic phonons and ionized impurities. A minimum is predicted for the linewidth as a function of magnetic field but only for a restricted range of electron and ionized-impurity densities. Near this minimum the linewidth is proportional to the square root of the impurity density and is independent of temperature.