Abstract
The classical theory of cyclotron resonance of a single electron (or any other charged particle) suggests giant broadening of resonant cyclotron line due to a hysteresis based on relativistic mass-effect proposed in [1] and observed recently in [2]. The quantum theory of the same phenomenon developed here predicts a multiple-line spectrum of a driven cyclotron resonance with equidistantly-spaced lines which is due to relativistic shift of Landau levels. The spacing ΔΩsp between-lines is determined as ΔΩsp/Ωo = ħΩo/moc2, where Ωo=eHo/moc is the unperturbed cyclotron frequency of electron. The linewidth ΔΩR of each of these lines is strictly of radiation nature, with the relative linewidth Γ = ΔΩR/Ωo = (2/3)reko, where re = e2/moc2 = 2.8×10−13cm is the classical radius of electron, and ko = Ωo/c. In the case of a single electron at λo(= 2π/ko) = 2mm, Γ ≈ 0.7×10−11.
© 1988 Optical Society of America
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