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5 September 2014 Terahertz magnetospectroscopy of a point contact based on CdTe/CdMgTe quantum well
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THz response of a number of samples based on CdTe/CdMgTe quantum wells grown by a molecular beam epitaxy was investigated at low temperatures and high magnetic fields. The experiments involved magnetotransport, photocurrent, and transmission measurements carried out with a monochromatic THz sources or a Fourier spectrometer. Samples of different geometry, with and without a gate metallization were used. We observed excitations of a two-dimensional plasma in the form of optically-induced Shubnikov-de Haas oscillations, cyclotron resonance transitions and magnetoplasmon resonances. A polaron effect was observed at magnetic fields higher than 10 T. A point contact device processed with an electron beam lithography was investigated as a detector of THz radiation. It was shown that the main mechanism responsible for a THz performance of the point contact was excitation of magnetoplasmons with a wave vector defined by geometrical constrictions of the device mesa.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
I. Grigelionis, M. Bialek, M. Grynberg, M. Czapkiewicz, V. Kolkovski, M. Wiater, M. Wojciechowski, J. Wróbel, T. Wojtowicz, N. Diakonova, W. Knap, and J. Łusakowski "Terahertz magnetospectroscopy of a point contact based on CdTe/CdMgTe quantum well", Proc. SPIE 9199, Terahertz Emitters, Receivers, and Applications V, 91990G (5 September 2014);


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