Angular dependent measurements of the ν = 5/2 fractional quantum Hall effect state at ultra-low temperatures

J. S. Xia, W. Pan, E. D. Adams, N. S. Sullivan, H. L. Stormer, D. C. Tsui, L. N. Pfeiffer, K. W. Baldwin, K. W. West

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations


The spin polarization of the obscure even-denominator FQHE state at ν = 5/2 remains an open, but important question to answer. One method to address this question is to measure the angular dependence of its energy gap. Since the energy gap at ν = 5/2 is rather small, this kind of experiments is technically extraordinary challenging, due to the requirement of in situ rotation of the sample at ultra-low temperatures. We constructed a rotator, made from polycarbonate and operated hydraulically using liquid 3He. A sequence of experiments at ν = 5/2 clearly demonstrated the possibility of performing angular-dependent measurements at temperatures below 10 mK.

Original languageEnglish (US)
Pages (from-to)109-110
Number of pages2
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1-3
StatePublished - May 2003
Externally publishedYes
Event23rd International Conference on Low Temperature Physics - Hiroshima, Japan
Duration: Aug 20 2002Aug 27 2002

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


  • Even-denominator
  • Fractional quantum Hall effect
  • Rotator
  • Ultra-low temperature


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