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<p>Interface engineering with an inherent symmetry in magnetic oxides is important both for fundamental science and applications of spintronic devices. However, previous efforts in manipulating inversion symmetry are mainly focused on heterostructures with ideal interfaces which precludes a large group of practically important materials. Here we demonstrate systematically tunable inversion symmetry through dynamically controllable interfacial disorders in the nominal (SrRuO<sub>3</sub>)<sub>2</sub>/(SrTiO<sub>3</sub>)<sub>2</sub> superlattice. By controlling the dynamic growth parameter - the pulsed laser ablation frequency, we realized controllable asymmetric Ru/Ti intermixing at the top and bottom interfaces of each supercell. Thus the inversion symmetry is absent at the two interfaces between SrRuO<sub>3</sub> and SrTiO<sub>3</sub>, with the degree of the asymmetry tunable. Moreover, the manipulation of the inversion symmetry induces possible variation to the Berry curvature, with a maximal change of the anomalous Hall resistivity by 1530%. First-principle density functional theory calculations illustrate the strong tendency of Ti/Ru intermixing and enhanced Ti ferromagnetism which both coincide to experimental observations. Our study opens up a new avenue in controlling the inversion symmetry with a broad spectrum of material candidates.</p>

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Continuous manipulation of the interfacial inversion symmetry in SrRuO3/SrTiO3 atomic layer superlattices

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年3月30日

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  • Mingrui Bao,
  • Haiyin Zhu,
  • Ruixiang Zhou,
  • Long Cheng,
  • Qing Wang,
  • Liuzhi Xiang,
  • Aidi Zhao,
  • Sai Mu,
  • Gang Li,
  • Xiaofang Zhai

摘要

Interface engineering with an inherent symmetry in magnetic oxides is important both for fundamental science and applications of spintronic devices. However, previous efforts in manipulating inversion symmetry are mainly focused on heterostructures with ideal interfaces which precludes a large group of practically important materials. Here we demonstrate systematically tunable inversion symmetry through dynamically controllable interfacial disorders in the nominal (SrRuO3)2/(SrTiO3)2 superlattice. By controlling the dynamic growth parameter - the pulsed laser ablation frequency, we realized controllable asymmetric Ru/Ti intermixing at the top and bottom interfaces of each supercell. Thus the inversion symmetry is absent at the two interfaces between SrRuO3 and SrTiO3, with the degree of the asymmetry tunable. Moreover, the manipulation of the inversion symmetry induces possible variation to the Berry curvature, with a maximal change of the anomalous Hall resistivity by 1530%. First-principle density functional theory calculations illustrate the strong tendency of Ti/Ru intermixing and enhanced Ti ferromagnetism which both coincide to experimental observations. Our study opens up a new avenue in controlling the inversion symmetry with a broad spectrum of material candidates.