Fractional quantum Hall effect at zero magnetic field observed in an unexpected material


The fractional quantum anomalous Hall effect occurs when the Hall resistance in a material is quantized to fractional multiples of the fundamental unit h/e2 at zero magnetic field. Observing the effect in a system consisting of a combination of five-layer graphene and hexagonal boron nitride enriches the family of topological matter phases, and opens up new opportunities in quantum computation.

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