Abstract-Photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance

M. Białek, J. Łusakowski, M. Czapkiewicz, J. Wróbel, and V. Umansky
https://journals.aps.org/prb/abstract/10.1103/PhysRevB.91.045437

Terahertz spectroscopy experiments at magnetic fields and low temperatures were carried out on samples of different gate shapes processed on a high electron mobility GaAs/AlGaAs heterostructure. For a given radiation frequency, multiple magnetoplasmon resonances were observed with a dispersion relation described within a local approximation of the magnetoconductivity tensor. The second harmonic of the cyclotron resonance was observed and its appearance was interpreted as resulting from a high-frequency, inhomogeneous electromagnetic field on the border of a two-dimensional electron gas with a metallic gate and/or an ohmic contact.

DOI: http://dx.doi.org/10.1103/PhysRevB.91.045437

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• Published 29 January 2015
• Received 9 October 2014
• Revised 13 January 2015

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