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High-mobility two-dimensional carriers originating from surface Fermi arcs inmagnetic Weyl semimetals are highly desired for accessing exotic quantumtransport phenomena and for topological electronics applications. Here, wedemonstrate high-mobility two-dimensional carriers that show quantumoscillations in magnetic Weyl semimetal SrRuO3 epitaxial films by systematicangle-dependent, high-magnetic field magnetotransport experiments. Theexceptionally high-quality SrRuO3 films were grown by state-of-the-art oxidethin film growth technologies driven by machine learning algorithm. The quantumoscillations for the 10-nm SrRuO3 film show a high quantum mobility of 3500cm2/Vs, a light cyclotron mass, and two-dimensional angular dependence, whichcan be attributed to the surface Fermi arcs. The linear thickness dependence ofthe phase shift of the quantum oscillations provides evidence for thenon-trivial nature of the quantum oscillations mediated by the surface Fermiarcs. In addition, at low temperatures and under magnetic fields of up to 52 T,the quantum limit of SrRuO3 manifests the chiral anomaly of the Weyl nodes.Emergence of the hitherto hidden two-dimensional Weyl states in a ferromagneticoxide pave the way to explore novel quantum transport phenomena for topologicaloxide electronics.

High-mobility two-dimensional carriers from surface Fermi arcs in magnetic Weyl semimetal films