Photomodulation spectroscopy and cyclotron resonance of Cd1-xMnxTe/CdTe semimagnetic and strained multi-quantum well structures

Photomodulation spectroscopy and cyclotron resonance of free carriers of Cd1−xMnxTe/CdTe multi-quantum wells are reported for the first time. Five peaks have been observed in the energy region of 1.55–1.80 eV by photoreflectance measurement at low temperature and assigned to excitonic transitions in quantum well. The band edge alignment and the valence band structure are determined by comparison of experimental transitions to envelope function calculation including strain effect. The cyclotron resonance of electrons in Cd1−xMnxTe/CdTe MQW has been observed by use of a modulated cyclotron resonance technique combined with an extra and monochromatic light excitation. The cyclotron mass mc∗ and ωτres are determined from fitting the experimental line-shape to the expressions of resonance and to be 0.096 m0 and around 2 respectively.