5 March 2015 Terahertz magneto-spectroscopy of a point contact based on CdTe/CdMgTe quantum well
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Abstract
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, Ignas Grigelionis, Marcin Białek, Marcin Białek, Marian Grynberg, Marian Grynberg, Magdalena Czapkiewicz, Magdalena Czapkiewicz, Valery Kolkovskiy, Valery Kolkovskiy, Maciej Wiater, Maciej Wiater, Tomasz Wojciechowski, Tomasz Wojciechowski, Jerzy Wróbel, Jerzy Wróbel, Tomasz Wojtowicz, Tomasz Wojtowicz, Nina Diakonova, Nina Diakonova, Wojciech Knap, Wojciech Knap, Jerzy Łusakowski, 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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