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New Resugts of Ugtra-Low Temperature Experiments in the Second Landau Level in a Two-Dimensional Electron System

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Abstract

In the second Landau level around ν=5/2 filling of an extremely high quality 2D electron system and at temperatures T down to 9 mK we observe a very strong even-denominator fractional quantum Hall effect at Landau level filling ν=5/2 and its energy gap is large and Δ∼ 0.45 K. A clear FQHE state is seen at ν=2+2/5, with well-quantized R xy. A novel, evendenominator FQHE state at ν=2+3/8 seems to develop, as deduced from the T-dependence of dR xy/dB. In addition, four fully developed re-entrant integral quantum Hall effect (RIQHE) states are also observed. At low temperatures, the wide RIQHE plateau around at ν=2+2/7 is interrupted by a dip, indicating an additional reentrance. Finally, the tigted magnetic field experiment at an ugtra-low temperature of 10 mK was carried out to examine the spin-polarization of the ν=5/2 FQHE state.

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Authors and Affiliations

  1. Department of Physics, University of Florida, Gainesville, FL, 32611, USA

    J. S. Xia, C. L. Vicente, E. D. Adams & N. S. Sullivan

  2. National High Magnetic Field Laboratory, Tallahassee, FL, 32310, USA

    J. S. Xia, W. Pan, C. L. Vicente, E. D. Adams & N. S. Sullivan

  3. Department of Electrical Engineering, Princeton University, Princeton, NJ, 08544, USA

    W. Pan & D. C. Tsui

  4. Department of Physics and Department of Applied Physics, Columbia University, New York, NY, 10027, USA

    H. L. Stormer

  5. Bell Labs, Lucent Technologies, Murray Hill, NJ, 07974, USA

    H. L. Stormer, L. N. Pfeiffer, K. W. Baldwin & K. W. West

Authors
  1. J. S. Xia
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  2. W. Pan
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  3. C. L. Vicente
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  4. E. D. Adams
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  5. N. S. Sullivan
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  6. H. L. Stormer
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  7. D. C. Tsui
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  8. L. N. Pfeiffer
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  9. K. W. Baldwin
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  10. K. W. West
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Xia, J.S., Pan, W., Vicente, C.L. et al. New Resugts of Ugtra-Low Temperature Experiments in the Second Landau Level in a Two-Dimensional Electron System. Journal of Low Temperature Physics 134, 579–583 (2004). https://doi.org/10.1023/B:JOLT.0000012612.06765.d5

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  • DOI: https://doi.org/10.1023/B:JOLT.0000012612.06765.d5

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