I. V. Andreev, V. M. Muravev, I. V. Kukushkin, J. H. Smet, K. von Klitzing, V. Umanskii, “Contactless measurement of the conductivity of two-dimensional electrons in the regime of microwave-induced giant magnetoresistance oscillations”, Pis'ma v Zh. Èksper. Teoret. Fiz., 2008, Volume 88, Issue 9,Pages <nobr>707

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CONDENSED MATTER

Contactless measurement of the conductivity of two-dimensional electrons in the regime of microwave-induced giant magnetoresistance oscillations

I. V. Andreev^a, V. M. Muravev^ab, I. V. Kukushkin^ab, J. H. Smet^b, K. von Klitzing^b, V. Umanskii^c

^a Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Moscow region, 142432, Russia
^b Max-Planck-Institut für Festkörperforschung, 70569 Stuttgart, Germany
^c Braun Center for Submicron Research, Weizmann Institute of Science, Rehovot, 76100, Israel

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.

PACS: 73.23.-b

Received: 19.09.2008