Far-Infrared Magneto-Optical Study of Photoexcited Indium Antimonide. I. General Characteristics

Time-resolved far-infrared cyclotron resonance was carried out at liquid helium temperatures for both n- and p-type InSb under intrinsic photoexcitation. The optically hot nature shows up very clearly for the photoelectron system. Detailed electron temperature analysis was carried out on a p-type sample, using the intensity ratio of the two lowest cyclotron transition signals. The electron temperature was found to decrease from 40 K at a time constant of 6.5 µs. Joint observation of electron and hole signals at four different wavelengths enabled us, using the calculation by Pidgeon and Brown, to modify the values of the Luttinger parameters of the valence band. Cyclotron emission similar to that detected under electrical excitation was observed in an n-type sample.