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Published July 15, 2011 | Published + Submitted
Journal Article Open

Insulating phase of a two-dimensional electron gas in Mg_xZn_(1−x)O/ZnO heterostructures below ν = 1/3

Kozuka, Y. ORCID icon
Tsukazaki, A. ORCID icon
Maryenko, D.
Falson, J. ORCID icon
Akasaka, S.
Nakahara, K.
Nakamura, S.
Awaji, S.
Ueno, K.
Kawasaki, M. ORCID icon
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Abstract

We report magnetotransport properties of a two-dimensional electron gas confined at MgZnO/ZnO heterointerface in a high magnetic field up to 26 T. High electron mobility and low charge carrier density enabled the observation of the fractional quantum Hall state ν = 1/3. For an even lower charge carrier density, we observe a transition from quantum Hall liquid to an insulator below the filling factor 1/3. Because of the large electron effective mass in ZnO, we suggest the MgZnO/ZnO heterostructures to be a prototype system for highly correlated quantum Hall physics.

Additional Information

© 2011 American Physical Society. (Received 29 May 2011; published 25 July 2011) This work was partly supported by Grants-in-Aids for Scientific Research No. 22840004 (Y.K.), No. 21686002, and No. 22103004 (K.U.) from MEXT, Japan, and by the Japan Society for the Promotion of Science (JSPS) through its "Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST Program)" (A.T.) as well as by Asahi Glass Foundation (M.K.).

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Published - PhysRevB.84.033304.pdf

Submitted - 1106.5605.pdf

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