[22p-E205-1~16] 10.1 新物質・新機能創成（作製・評価技術）

▲ [22p-E205-1] [The 51st Young Scientist Presentation Award Speech] Quantum limit transport and Two-dimensional Weyl fermions in epitaxial ferromagnetic oxide SrRuO₃ thin films

〇Shingo Kaneta^1,2、Yuki. K Wakabayashi¹、Yoshiharu Krockenberger¹、Toshihiro Nomura³、Yoshimitsu Kohama³、Hiroshi Irie¹、Kosuke Takiguchi²、Shinobu Ohya^2,4,5、Masaaki Tanaka^2,5、Yoshitaka Taniyasu¹、Hideki Yamamoto¹ (1.NTT-BRL、2.Univ. of Tokyo、3.ISSP, Univ. of Tokyo、4.IEI, Univ. of Tokyo、5.CSRN, Univ. of Tokyo)

キーワード：Weyl fermion, two-dimensional transport, quantum limit transport

High-mobility two-dimensional carriers originating from pairs of Weyl nodes in magnetic Weyl semimetals are highly desired for their topological and spin electronics applications. The two-dimensional carriers in topological semimetals are realized due to surface Fermi arcs.
In this presentation, we report thickness- and angle-dependent magnetotransport properties, including quantum oscillations, of magnetic Weyl semimetal SrRuO₃. The quantum oscillations for the 10-nm SrRuO₃ film show that the high-mobility two-dimensional carriers originate from surface Fermi arcs. When a magnetic field was applied parallel to the current, the negative magnetoresistance (MR) saturated in the quantum limit, confirming that the negative MR is induced by the chiral anomaly of Weyl nodes. These findings further highlight SrRuO₃ as an intriguing platform for topological oxide electronics and for exploring exotic quantum transport phenomena in magnetic Weyl semimetals.