Research Papers

Terahertz magneto-spectroscopy of a point contact based on CdTe/CdMgTe quantum well

[+] Author Affiliations
Ignas Grigelionis, Marcin Białek, Marian Grynberg, Jerzy Łusakowski

University of Warsaw, Faculty of Physics, ul. Pasteura 5, Warsaw 02-093, Poland

Magdalena Czapkiewicz, Valery Kolkovskiy, Maciej Wiater, Tomasz Wojciechowski, Tomasz Wojtowicz

Institute of Physics, PAS, al. Lotników 32/46, Warsaw 02-668, Poland

Jerzy Wróbel

Institute of Physics, PAS, al. Lotników 32/46, Warsaw 02-668, Poland

Rzeszów University, Faculty of Mathematics and Natural Sciences, al. Rejtana 16C, Rzeszów 35-959, Poland

Nina Diakonova, Wojciech Knap

Université Montpellier 2, Laboratoire Charles Coulomb UMR 5221 CNRS-UM2, Place Eugéne Bataillon CC069, Montpellier Cedex 5 F-34905, France

J. Nanophoton. 9(1), 093082 (Mar 05, 2015). doi:10.1117/1.JNP.9.093082
History: Received October 30, 2014; Accepted February 16, 2015
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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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Ignas Grigelionis ; Marcin Białek ; Marian Grynberg ; Magdalena Czapkiewicz ; Valery Kolkovskiy, et al.
"Terahertz magneto-spectroscopy of a point contact based on CdTe/CdMgTe quantum well", J. Nanophoton. 9(1), 093082 (Mar 05, 2015). ; http://dx.doi.org/10.1117/1.JNP.9.093082


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