Exact quantization of the even-denominator fractional quantum hall state at υ=5/2 landau level filling factor

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

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Abstract

We report ultralow temperature experiments on the obscure fractional quantum Hall effect at Landau level filling factor υ=5/2 in a very high-mobility specimen of μ=1.7×107cm2/Vs. We achieve an electron temperature as low as ˜4mK, where we observe vanishing Rxx and, for the first time, a quantized Hall resistance, Rxy=h/(5/2)e2 to within 2 ppm. Rxy at the neighboring odd-denominator states υ=7/3 and 8/3 is also quantized. The temperature dependences of the Rxx minima at these fractional fillings yield activation energy gaps Δ5/2=0.11, Δ7/3=0.10, and Δ8/3=0.55K.

Original languageEnglish (US)
Pages (from-to)3530-3533
Number of pages4
JournalPhysical review letters
Volume83
Issue number17
DOIs
StatePublished - Jan 1 1999
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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