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The two-dimensional electron system in an InAs quantum well has emerged as aprime candidate for hosting exotic quasi-particles with non-Abelian statisticssuch as Majorana fermions and parafermions. To attain its full promise,however, the electron system has to be clean enough to exhibitelectron-electron interaction phenomena. Here we report the observation offractional quantum Hall effect in a very low disorder InAs quantum well with awell-width of 24 nm, containing a two-dimensional electron system with adensity $n=7.8 \times 10^{11}$ cm$^{-2}$ and low-temperature mobility $1.8\times 10^6$ cm$^2$/Vs. At a temperature of $\simeq35$ mK and $B\simeq24$ T, weobserve a deep minimum in the longitudinal resistance, accompanied by a nearlyquantized Hall plateau at Landau level filling factor $\nu=4/3$.

Observation of fractional quantum Hall effect in an InAs quantum well