Abstract
We report on cyclotron resonance (CR) experiments of high-quality C-doped two-dimensional hole systems in GaAs/AlGaAs quantum wells covering the microwave and far-infrared regimes. At high magnetic field $B$ we observe a strong $B$ dependence of the cyclotron mass ${m}_{c}$ which can be reproduced by calculations based on a $4\ifmmode\times\else\texttimes\fi{}4$ Luttinger Hamiltonian in the axial approximation. At small $B$ one main and up to three secondary CRs are found, which continuously evolve with smooth magnetic-field dependences. This has not been observed and predicted so far. In the regime of the magnetic quantum limit a further CR is observed, which can be attributed to a transition between Landau levels originating from the two different spin-split heavy- and light-hole subbands.
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