Other even-denominator fractions

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

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Experimental data on the sequence of fractional quantum Hall effects (FQHE) states around Landau level filling factor v = 1/2 are well explained within the framework of the composite fermion model. Around other even-denominator fractions the situation is less clear, experimentally as well as theoretically. In this paper we report experimental studies at even-denominator fillings at v = 1/4, 3/4, 5/2, etc. We show that the composite fermion picture can be applied successfully to the fractions at v = 1/4 and 3/4. Their effective mass, when normalized to B1/2 (where B is the magnetic field) and their effective g factor are very similar to the composite fermions at v = 1/2 and 3/2. Our ultra-low-temperature study at v = 5/2 shows that this fraction is a true FQHE state, showing vanishing Rxx and a Hall resistance Rxy precisely quantized to h/(5/2e2).

Original languageEnglish (US)
Pages (from-to)9-16
Number of pages8
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Issue number1
StatePublished - Jan 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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