Splitting Of Cyclotron Resonance Line Research Articles

Cyclotron-resonance line splitting in heavily doped p-type GaAs heterojunctions

In this paper, we report on submillimeter magneto-absorption studies of heavily doped (1 0 0) AlGaAs/GaAs heterojunctions. We found that the CR spectra consist of two branches with cyclotron-resonance effective masses of m=0.18 m o and 0.373 m o. These values are close to those predicted theoretically, and can be ascribed to the inversion asymmetry-induced spin splitting. In addition, we observed anticrossing features in the CR spectra. We discuss a possible origin of such CR line behavior as a coupling of light and heavy holes.

Effect of the spin-orbit interaction on the cyclotron resonance of two-dimensional electrons

In the cyclotron resonance (CR) spectra of two-dimensional (2D) electrons in InAs quantum wells, the CR line splitting is observed. The splitting is found to be an oscillating function of magnetic field. The oscillations do not correlate with the filling factor. The experimental results are interpreted in terms of the spin-orbit splitting in the presence of a built-in electric field appearing due to the asymmetry of the quantum-well potential. From the splitting of the CR line, the spin-orbit coupling constant αso is determined. The resulting value agrees well with the value obtained for the same sample from the Shubnikov-de Haas oscillations. The role of the resonance interaction of charge carriers in the well with the interface donor states is discussed.

Cyclotron resonance in the InAs/GaSb heterostructure in an inclined magnetic field

The mechanism of cyclotron resonance line splitting in the InAs/GaSb heterostructure in an inclined magnetic field has been studied experimentally and theoretically. It is shown that the admixing of electron and hole states leads to anticrossing of the Landau levels and, hence, to splitting of the cyclotron resonance line. In the case of an inclined magnetic field, the splitting is not observed, which is explained by the suppression of the admixing of electron and hole states due to the occurrence of an additional barrier for electrons and holes given a longitudinal magnetic field component.