Abstract
Magnetic-field dependences of the conductivity of a two-dimensional electron system obtained by contact and contactless measurements in the regime of microwave-induced giant magnetoresistance oscillations have been comparatively analyzed. The contactless technique for studying the conductivity of two-dimensional electrons is based on measuring the attenuation of the RF signal propagating along a coplanar waveguide manufactured using lithography on the sample surface. It has been found that Shubnikov-de Haas oscillations of conductivity are observed in both techniques, whereas the microwave-induced giant magnetoresistance oscillations appear only in the contact measurements. This contradiction indicates that the contact and/or boundary regions of the two-dimensional system with a strong potential gradient play an important role for the observation of the induced magnetoresistance oscillations.
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Original Russian Text © I.V. Andreev, V.M. Murav’ev, I.V. Kukushkin, J.H. Smet, K. von Klitzing, V. Umanskii, 2008, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2008, Vol. 88, No. 9, pp. 707–711.
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Andreev, I.V., Murav’ev, V.M., Kukushkin, I.V. et al. Contactless measurement of the conductivity of two-dimensional electrons in the regime of microwave-induced giant magnetoresistance oscillations. Jetp Lett. 88, 616–619 (2008). https://doi.org/10.1134/S0021364008210157
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DOI: https://doi.org/10.1134/S0021364008210157