5 March 2015 Terahertz magneto-spectroscopy of a point contact based on CdTe/CdMgTe quantum well
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To understand a terahertz (THz) response of a point contact device, a number of samples based on CdTe/CdMgTe quantum wells grown by a molecular beam epitaxy were investigated at low temperatures and high magnetic fields. The experiments involved magneto-transport, photocurrent, and transmission measurements carried out with monochromatic THz sources or a Fourier spectrometer. Samples of different geometry with and without gate metallization were used. We observed excitations of a two-dimensional electron plasma in the form of optically induced Shubnikov-de Haas oscillations, cyclotron resonance transitions, and magneto-plasmon 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 magneto-plasmons with a wavevector defined by geometrical constrictions of the device mesa.
© 2015 Society of Photo-Optical Instrumentation Engineers (SPIE)
Ignas Grigelionis, Marcin Białek, Marian Grynberg, Magdalena Czapkiewicz, Valery Kolkovskiy, Maciej Wiater, Tomasz Wojciechowski, Jerzy Wróbel, Tomasz Wojtowicz, Nina Diakonova, Wojciech Knap, Jerzy Łusakowski, "Terahertz magneto-spectroscopy of a point contact based on CdTe/CdMgTe quantum well," Journal of Nanophotonics 9(1), 093082 (5 March 2015). https://doi.org/10.1117/1.JNP.9.093082 . Submission:

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