Temperature-dependent magnetotransport around ν=1/2 in ZnO heterostructures

D. Maryenko, J. Falson, Y. Kozuka, A. Tsukazaki, M. Onoda, H. Aoki, M. Kawasaki

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

The sequence of prominent fractional quantum Hall states up to ν=5/11 around ν=1/2 in a high-mobility two-dimensional electron system confined at oxide heterointerface (ZnO) is analyzed in terms of the composite fermion model. The temperature dependence of R xx oscillations around ν=1/2 yields an estimation of the composite fermion effective mass, which increases linearly with the magnetic field. This mass is of similar value to an enhanced electron effective mass, which in itself arises from strong electron interaction. The energy gaps of fractional states and the temperature dependence of R xx at ν=1/2 point to large residual interactions between composite fermions.

Original languageEnglish
Article number186803
JournalPhysical Review Letters
Volume108
Issue number18
DOIs
Publication statusPublished - 2012 May 1

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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