Transport evidence for phase separation into spatial regions of different fractional quantum Hall fluids near the boundary of a two-dimensional electron gas

A. M. Chang and J. E. Cunningham
Phys. Rev. Lett. 69, 2114 – Published 5 October 1992
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Abstract

Near the boundary, a 2D electron gas can phase separate into fractional quantum Hall fluid regions of successively lower filling factors (ν), in the case of a slowly increasing boundary potential. We present experimental evidence in the ν=1/3, 2/3, and 1 quantum Hall regimes on a four-lead Hall junction showing that by side gating the junction boundary, the Hall resistance can be made to approach the quantized value of the lower ν fluids in the top-gated leads, rather than the higher-ν fluid at the junction center. This implies the presence of the lower-ν fluids near the junction boundary.

  • Received 14 May 1992

DOI:https://doi.org/10.1103/PhysRevLett.69.2114

©1992 American Physical Society

Authors & Affiliations

A. M. Chang

  • AT&T Bell Laboratories, Murray Hill, New Jersey 07974

J. E. Cunningham

  • AT&T Bell Laboratories, Holmdel, New Jersey 07733

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Vol. 69, Iss. 14 — 5 October 1992

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