Magnetoplasmons in a High Electron Mobility GaAs/AlGaAs Heterostructure

M. Białek, K. Karpierz, B. Piętka, M. Grynberg, J. Łusakowski Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Hoża 69, 00-681 Warsaw, Poland

M. Czapkiewicz, K. Fronc, J. Wróbel Institute of Physics, PAS, al. Lotników 32/46, 02-668 Warsaw, Poland

and V. Umansky Weizmann Institute of Science, Rehevot 76100, Israel

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We have observed a multimode spectrum of magnetoplasmons in the Hall bars processed on a high electron mobility GaAs/AlGaAs heterostructure. We have found that the dispersion relation of these excitation follows square root dependence. Calculated wavelength of the fundamental magnetoplasmon mode fits to the width of sample.

DOI: 10.12693/APhysPolA.122.1096 PACS numbers: 73.20.Mf