Utilizing state-independent projection operators, we obtain a Lorentzian form of cyclotron-transition absorption spectra in the quantum limit. The linewidth formula is applied to determine the dilation and uniaxial deformation-potential constants (${\mathrm{\Xi }}_{\mathit{d}}$, ${\mathrm{\Xi }}_{\mathit{u}}$) for anisotropic materials. By fitting the theoretical values to the experimental data, we obtain ${\mathrm{\Xi }}_{\mathit{u}}$=18.0±0.6 eV and ${\mathrm{\Xi }}_{\mathit{d}}$=-12.2±0.68 eV for Ge. © 1996 The American Physical Society.

• Received 24 May 1995

DOI:https://doi.org/10.1103/PhysRevB.53.6896