Landau-split and spin-split cyclotron resonance of two-dimensional electron systems in HgTe quantum wells

Cyclotron resonances of high-mobility electrons in inverted semiconducting type HgTe quantum wells were investigated at liquid helium temperatures by far-infrared Fourier transform spectroscopy. Due to the energy dependence of the electron effective mass and the high electron mobilities in excess of 70000 cm 2 V -1 s -1 , the spin-splitting and the Landau-splitting of the cyclotron resonance could be resolved. At the conduction subband edge an effective mass m 0 * 0.016 m c and a Lande g-factor |g 0 | 20 was obtained. The experiment is in good agreement with predictions based on the single-particle approximation.