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

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<jats:title>Abstract</jats:title><jats:p>High-mobility two-dimensional carriers originating from surface Fermi arcs in magnetic Weyl semimetals are highly desired for accessing exotic quantum transport phenomena and for topological electronics applications. Here, we demonstrate high-mobility two-dimensional carriers that show quantum oscillations in magnetic Weyl semimetal SrRuO<jats:sub>3</jats:sub> epitaxial films by systematic angle-dependent, high-magnetic field magnetotransport experiments. The exceptionally high-quality SrRuO<jats:sub>3</jats:sub> films were grown by state-of-the-art oxide thin film growth technologies driven by machine-learning algorithm. The quantum oscillations for the 10-nm SrRuO<jats:sub>3</jats:sub> film show a high quantum mobility of 3.5 × 10<jats:sup>3</jats:sup> cm<jats:sup>2</jats:sup>/Vs, a light cyclotron mass, and two-dimensional angular dependence, which possibly come from the surface Fermi arcs. The linear thickness dependence of the phase shift of the quantum oscillations provides evidence for the non-trivial nature of the quantum oscillations mediated by the surface Fermi arcs. In addition, at low temperatures and under magnetic fields of up to 52 T, the quantum limit of SrRuO<jats:sub>3</jats:sub> manifests the chiral anomaly of the Weyl nodes. Emergence of the hitherto hidden two-dimensional Weyl states in a ferromagnetic oxide paves the way to explore quantum transport phenomena for topological oxide electronics.</jats:p>

Journal

  • npj Quantum Materials

    npj Quantum Materials 7 (1), 102-, 2022-10-07

    Springer Science and Business Media LLC

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