Journal
PHYSICAL REVIEW B
Volume 77, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.77.081301
Keywords
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We present activation gap measurements of the fractional quantum Hall effect (FQHE) in the second Landau level. Signatures for 14 (5) distinct incompressible FQHE states are seen in a high- (low-) mobility sample with the enigmatic 5/2 even-denominator FQHE having a large activation gap of similar to 500 (similar to 250) mK in the high- (low-) mobility sample. This is the largest gap ever reported for the 5/2 FQHE state. Our measured large relative gaps for 5/2, 7/3, and 8/3 FQHEs indicate the emergence of exotic FQHE correlations in the second Landau level, possibly different from the well-known lowest-Landau-level Laughlin correlations. Our measured 5/2 gap is found to be in reasonable agreement with the theoretical gap once finite-width and disorder-broadening corrections are taken into account.
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