EFFECT OF NONPARABOLICITY ON FREE-CARRIER ABSORPTION IN SEMICONDUCTORS AT QUANTIZING MAGNETIC-FIELDS

Effect of the nonparabolicity on free-carrier absorption in nondegenerate semiconductors has been investigated at quantizing magnetic fields. The dominant scattering mechanism for electrons is assumed to be of the acoustic phonon scattering via the deformation-potential coupling. When the radiation is polarized parallel to a magnetic field, the absorption coefficient oscillates with the magnetic field in lower fields and then increases monotonically with the field. These oscillations of the abosrption coefficient with the magnetic field will be diminished with decreasing temperature and depend on the band gap of semiconductors.