Observation of a Fractional Quantum Hall State at $ν=1/4$ in a Wide GaAs Quantum Well

Details Observation of a Fractional Quantum Hall State at $ν=1/4$ in a Wide GaAs Quantum Well Observation of a Fractional Quantum Hall State at $ν=1/4$ in a Wide GaAs Quantum Well

2008-10-13

arxiv.org/abs/0810.2274v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.101.266804

We report the observation of an even-denominator fractional quantum Hall (FQH) state at $\nu=1/4$ in a high quality, wide GaAs quantum well. The sample has a quantum well width of 50 nm and an electron density of $n_e=2.55\times10^{11}$ cm$^{-2}$. We have performed transport measurements at $T\sim35$ mK in magnetic fields up to 45 T. When the sample is perpendicular to the applied magnetic field, the diagonal resistance displays a kink at $\nu=1/4$. Upon tilting the sample to an angle of $\theta=20.3^o$ a clear FQH state at emerges at $\nu=1/4$ with a plateau in the Hall resistance and a strong minimum in the diagonal resistance.

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