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Published March 2, 1992 | public
Journal Article Open

New fractional quantum Hall state in double-layer two-dimensional electron systems

Abstract

Transport studies on bilayer two-dimensional electron systems in GaAs double quantum wells have revealed a new fractional quantum Hall state that has no known counterpart in a single-layer 2D system. At total filling fraction ν=1/2 we observe a deep minimum in the diagonal resistivity and a flat Hall plateau within 1.5% of 2h/e^2. Studies of this new state in several samples with varying densities and layer separations strongly suggest this new state arises from interlayer Coulomb correlations. The data also suggest that the ν=1 quantum Hall effect seen in these samples has a similar origin.

Additional Information

©1992 The American Physical Society Received 10 December 1991 We note that after the original observations reported here we learned of similar results of Suen et al. [14]. We thank M. Shayegan for kindly giving us a prerint prior to publication.

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