The photoresponse of a two-dimensional electron gas at the second harmonic of the cyclotron resonance

M. Białek, M. Czapkiewicz, J. Wróbel, V. Umansky, J. Łusakowski

Published 2014-12-03Version 1

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.