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Microwave-Induced Oscillations in Magnetocapacitance: Direct Evidence for Nonequilibrium Occupation of Electronic States

S. I. Dorozhkin, A. A. Kapustin, V. Umansky, K. von Klitzing, and J. H. Smet
Phys. Rev. Lett. 117, 176801 – Published 17 October 2016
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Abstract

In a two-dimensional electron system, microwave radiation may induce giant resistance oscillations. Their origin has been debated controversially and numerous mechanisms based on very different physical phenomena have been invoked. However, none of them have been unambiguously experimentally identified, since they produce similar effects in transport studies. The capacitance of a two-subband system is sensitive to a redistribution of electrons over energy states, since it entails a shift of the electron charge perpendicular to the plane. In such a system, microwave-induced magnetocapacitance oscillations have been observed. They can only be accounted for by an electron distribution function oscillating with energy due to Landau quantization, one of the quantum mechanisms proposed for the resistance oscillations.

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  • Received 8 May 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.176801

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

S. I. Dorozhkin and A. A. Kapustin

  • Institute of Solid State Physics RAS, 142432 Chernogolovka, Moscow district, Russia

V. Umansky

  • Department of Physics, Weizmann Institute of Science, 76100 Rehovot, Israel

K. von Klitzing and J. H. Smet

  • Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany

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Issue

Vol. 117, Iss. 17 — 21 October 2016

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