Far infrared Faraday rotation in a two-dimensional electron gas

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Abstract
The Faraday rotation is a sensitive method for determining the effective mass of the charge carriers in a two-dimensional electron gas. At light frequencies much larger than the cyclotron frequency the Faraday rotation is independent of scattering. Faraday rotation, combined with transport measurements, allows a determination of the populations of the subbands and the subband energy separations in an inversion layer on p-Si (100). A metal-oxide-semiconductor (MOS) system will show an enhancement of the measured Faraday rotation because of multiple internal reflections of the light between the metal and substrate boundaries of the system. Our calculations give a twentyfold enhancement. The resonance Faraday rotation at light frequencies close or equal to the cyclotron frequency permits the determination of scattering parameters.

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