A magneto-optical and paramagnetic resonance investigation was made of DX centers in a 300-thick layer of Te-doped Ga0.54Al0.46As which had been grown by means of liquid-phase epitaxy and then removed from the substrate. Magnetic circular dichroism of optical absorption in the near-infrared region was found upon photo-exciting DX centers with a threshold of 0.6eV. This agreed with an infra-red band which had previously been found for metastable Te0 centers. On the basis of a magnetic circular dichroism absorption-detected electron paramagnetic resonance line in which no hyperfine splitting of 125Te was resolved, it was concluded that metastable Te0 was an effective mass theory state which was derived from the X-band minimum, and that the infra-red band was a photo-ionization transition to the excited X3 conduction band minimum.

M.V.B.Pinheiro, M.Linde, H.Ohkura, J.M.Spaeth: Semiconductor Science and Technology, 1996, 11[1], 63-7