Abstract
Two-dimensional (2D) electron systems, which exist in metal-oxide-semiconductor-and semiconductor heterostructures, are interesting physical systems. The interest arises from unique physical properties of the 2D systems and from the possibility to vary easily the 2D charge density and thus many related properties in the system. A powerful tool for the investigation of the 2D system is far-infrared (FIR) spectroscopy. With differential FIR spectroscopy the dynamic 2D conductivity ∂ (ω) is measured. By use of grating coupler techniques also excitations ∂(ω,q) with wave vectors q>ω/c can be studied. The spectroscopic techniques will be reviewed briefly with emphasis on rapid scan Fourier-transform spectroscopy. Some recent experimental results on the spectroscopic determination of the inherent spin splitting in hole subband systems, interaction of 2D carriers with optical phonons in silicon and investigations of 2D plasmons in homogeneous and spatially modulated electron systems will be discussed.
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