Quantum Hall effect in a triple-layer electron system

J. Jo, Y. W. Suen, L. W. Engel, M. B. Santos, M. Shayegan

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26 Scopus citations

Abstract

We report magnetotransport measurements in a low-disorder three-layer electron system in a GaAs/AlxGa1-xAs triple quantum-well structure. Fine adjustment of densities in different layers is achieved with the use of front and back gates and by monitoring the capacitance-voltage and low-field Shubnikov-de Haas data. At intermediate fields the diagonal resistance (Rxx) shows strong minima at every third integer filling factor, ν=3, 6, 9, and 12, consistent with the subband structure. At higher fields, we observe deep Rxx minima at ν=7/5 and 5/7, suggesting anomalously strong 7/5 and 5/7 fractional quantum Hall states in this triple-layer system.

Original languageEnglish (US)
Pages (from-to)9776-9779
Number of pages4
JournalPhysical Review B
Volume46
Issue number15
DOIs
StatePublished - 1992

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics

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