Observation of fractional quantum Hall effect in an InAs quantum well

Original · EN

The two-dimensional electron system in an InAs quantum well has emerged as a prime candidate for hosting exotic quasi-particles with non-Abelian statistics such as Majorana fermions and parafermions. To attain its full promise, however, the electron system has to be clean enough to exhibit electron-electron interaction phenomena. Here we report the observation of fractional quantum Hall effect in a very low disorder InAs quantum well with a well-width of 24 nm, containing a two-dimensional electron system with a density n=7.8 × 10¹¹ cm⁻² and low-temperature mobility 1.8 × 10⁶ cm²/Vs. At a temperature of ≃35 mK and B≃24 T, we observe a deep minimum in the longitudinal resistance, accompanied by a nearly quantized Hall plateau at Landau level filling factor ν=4/3.