Published February 18, 2002 | Submitted + Published
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Insulating and Fractional Quantum Hall States in the First Excited Landau Level

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Abstract

The observation of new insulating phases of two-dimensional electrons in the first excited Landau level is reported. These states, which are manifested as reentrant integer quantized Hall effects, exist alongside well-developed even-denominator fractional quantized Hall states at ν = 7/2 and 5/2 and new odd-denominator states at ν = 3+1/5 and 3+4/5.

Additional Information

© 2002 The American Physical Society. Received 24 September 2001; published 30 January 2002. This work was supported by the DOE under Grant No. DE-FG03-99ER45766 and the NSF under Grant No. DMR0070890.

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