Observation of a fractional quantum hall state at ν=1/4 in a wide GaAs quantum well

D. R. Luhman, W. Pan, D. C. Tsui, L. N. Pfeiffer, K. W. Baldwin, K. W. West

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Abstract

We report the observation of an even-denominator fractional quantum Hall state at ν=1/4 in a high quality, wide GaAs quantum well. The sample has a quantum well width of 50 nm and an electron density of ne=2.55×1011cm-2. We have performed transport measurements at T∼35mK in magnetic fields up to 45 T. When the sample is perpendicular to the applied magnetic field, the diagonal resistance displays a kink at ν=1/4. Upon tilting the sample to an angle of θ=20.3° a clear fractional quantum Hall state emerges at ν=1/4 with a plateau in the Hall resistance and a strong minimum in the diagonal resistance.

Original languageEnglish (US)
Article number266804
JournalPhysical review letters
Volume101
Issue number26
DOIs
StatePublished - Dec 22 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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