ACTA

Terahertz Response of a Point Contact Based on CdTe/CdMgTe Quantum Well in Magnetic Field

I. Grigelionis^a, M. Białek^a, M. Grynberg^a, M. Czapkiewicz^b, V. Kolkovskiy^b, M. Wiater^b, T. Wojciechowski^b, J. Wróbel^b, T. Wojtowicz^b, D. But^c, W. Knap^c and J. Łusakowski^a
^aInstitute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland
^bInstitute of Physics, PAS, al. Lotników 32/46, 02-668 Warsaw, Poland
^cTERALAB & L2C CNRS, Université Montpellier 2, 34095 Montpellier, France

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A photoresponse at THz frequencies of a quantum point contact fabricated on a CdTe/CdMgTe quantum well was studied at low temperatures as a function of magnetic field. The spectra show a structure which was interpreted as resulting from the cyclotron resonance and magnetoplasmon excitations. The wavelength of the fundamental magnetoplasmon mode was found to be about 2 μm which coincides with one of dimensions of the point contact. We also discuss the possibility of coupling of magnetoplasmon modes to shallow impurity transitions in the quantum well.

DOI: 10.12693/APhysPolA.122.1069
PACS numbers: 85.30.Hi, 73.20.Mf