Microwave magnetoplasma resonances of two-dimensional electrons in MgZnO/ZnO heterojunctions

Creators: Kozlov, V. E.; Van'kov, A. B.; Gubarev, S. I.; Kukushkin, I. V.; Solovyev, V. V.; Falson, J.; Maryenko, D.; Kozuka, Y.; Tsukazaki, A.; Kawasaki, M.; Smet, J. H.

Abstract

The plasma, magnetoplasma, and edge magnetoplasma excitations were investigated in two-dimensional electron systems hosted at the heterointerface of MgZnO/ZnO structures using optical detection of resonant microwave absorption. The magnetodispersion of the plasma excitations allowed the extraction of the electron effective mass. It was found to exhibit a surprisingly large dependence on the electron density, which is difficult to account for just from nonparabolicity effects.

Additional Information

© 2015 American Physical Society. (Received 27 June 2014; revised manuscript received 18 November 2014; published 9 February 2015) I.V.K., A.B.V., V.E.K., S.I.G., and V.V.S. thank the Russian Scientific Foundation (Grant No. 14-12-00693) for support in developing the method of optical detection of resonant microwave absorption in ZnO heterostructures. This work was partly supported by Grant-in-Aids for Scientific Research (S) No. 24226002 from MEXT, Japan, "Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST)," Program from the Japan Society for the Promotion of Science (JSPS) initiated by the Council for Science and Technology Policy. J.F. acknowledges the support of the Marubun Research Promotion Foundation.

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Published - PhysRevB.91.085304.pdf

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