Correlation-enhanced effective mass of two-dimensional electrons in Mg xZn1-xO/ZnO heterostructures

Y. Kasahara, Y. Oshima, J. Falson, Y. Kozuka, A. Tsukazaki, M. Kawasaki, Y. Iwasa

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21 Citations (Scopus)

Abstract

We performed combined magnetotransport and cyclotron resonance experiments on two-dimensional electron systems confined in the MgxZn 1-xO/ZnO heterostructures over a wide range of carrier densities, from 1.9 to 12×1011cm-2 (3.5â‰r sâ‰10, where rs is the Wigner-Seitz radius). As the carrier density was reduced, the transport mass mtr* was strongly enhanced. In marked contrast, the effective masses determined from the cyclotron resonance mCR* were found to be independent of the carrier density and <?format ?>as large as the bulk effective mass. The large enhancement of mtr*, which exceeds mCR* by ∼60%, at the lowest carrier density with rs∼10 is purely attributed to the strong electron correlation.

Original languageEnglish
Article number246401
JournalPhysical review letters
Volume109
Issue number24
DOIs
Publication statusPublished - 2012 Dec 10
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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