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Observation of excess conductance of a constricted electron gas in the fractional quantum Hall regime

B. W. Alphenaar, J. G. Williamson, H. van Houten, C. W. J. Beenakker, and C. T. Foxon
Phys. Rev. B 45, 3890(R) – Published 15 February 1992
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Abstract

We present experimental results on the conductance of a two-dimensional electron system of filling factor ν2D in the fractional quantum Hall regime, containing a constricted region of lower filling factor νc. Conductance fluctuations are observed as a function of the voltage on the gate defining the constriction. The temperature dependence of the fluctuations exhibits three distinct regimes, governed by νc. For temperatures below 100 mK, and for ν2D=1/3, one anomalous peak increases to a value above the quantized conductance ν2D(e2/h) of the bulk.

  • Received 21 November 1991

DOI:https://doi.org/10.1103/PhysRevB.45.3890

©1992 American Physical Society

Authors & Affiliations

B. W. Alphenaar, J. G. Williamson, H. van Houten, and C. W. J. Beenakker

  • Philips Research Laboratories, 5600 JA Eindhoven, The Netherlands

C. T. Foxon

  • Philips Research Laboratories, Redhill RH1 5HA, United Kingdom

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Issue

Vol. 45, Iss. 7 — 15 February 1992

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