Cyclotron Resonance in Cadmium Telluride

Cyclotron-resonance experiments were carried out on cleaved samples of high-purity $n$-type CdTe at liquid-helium temperatures and a frequency of 70 Gc/sec. A single well-defined resonance line believed due to electrons was observed under photoexcitation. Rotation of the magnetic field in the (110) plane showed no evidence for anisotropy. An electron effective mass of $m_p=(0.096\mathrm{}\pm 0.005)m_e$ was obtained. The cyclotron-resonance photosensitivity-versus-wavelength spectrum was found to peak strongly in the vicinity of the direct exciton transition. These results provide data not only for the value of the effective electron mass, but also for additional empirical evidence demonstrating the single-valley behavior of the conduction band of CdTe.