Abstract
The cyclotron resonance of two-dimensional electron systems (2DES) of GaAs/AlGaAs heterostructures is investigated in a tilted magnetic field. In this study, the perpendicular ( B ⊥) and in-plane ( B ||) magnetic fields are changed systematically. More than two cyclotron resonances caused by B || are observed. Further, the enhancement of cyclotron mass by B || and its dependence on B ⊥ and electron concentration of 2DES are also investigated in detail. These phenomena are well explained by the resonant subband Landau level coupling model.
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