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<p>A topological superconductor, characterized by either a chiral order parameter or a topological surface state in proximity to bulk superconductivity, is foundational to topological quantum computing. A key open challenge is whether electron-electron interactions can tune such topological superconducting phases. Here, we provide experimental signatures of a unique topological superconducting phase in competition with electronic correlations in 10-unit-cell thick FeTe<sub>x</sub>Se<sub>1-x</sub> films grown on SrTiO<sub>3</sub> substrates. When the Te content <i>x</i> exceeds 0.7, we observe a topological transition marked by the emergence of a superconducting surface state. Near the FeTe limit, the system undergoes another transition where the surface state disappears, and superconductivity is suppressed. Theory suggests that electron-electron interactions in the odd-parity <i>xy</i><sup><i>−</i></sup> band drives this second topological transition. The flattening and eventual decoherence of <i>d</i><sub><i>xy</i></sub>-derived bands track the superconducting dome, linking correlation effects directly to superconducting coherent transport. Our work establishes many-body electronic correlations as a sensitive knob for tuning topology and superconductivity, offering a pathway to engineer new topological phases in correlated materials.</p>

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A topological superconductor tuned by electronic correlations

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年12月26日

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  • Haoran Lin,
  • Christopher L. Jacobs,
  • Chenhui Yan,
  • Gillian M. Nolan,
  • Gabriele Berruto,
  • Patrick Singleton,
  • Khanh Duy Nguyen,
  • Yunhe Bai,
  • Qiang Gao,
  • Xianxin Wu,
  • Chao-Xing Liu,
  • Gangbin Yan,
  • Suin Choi,
  • Chong Liu,
  • Nathan P. Guisinger,
  • Pinshane Y. Huang,
  • Subhasish Mandal,
  • Shuolong Yang

摘要

A topological superconductor, characterized by either a chiral order parameter or a topological surface state in proximity to bulk superconductivity, is foundational to topological quantum computing. A key open challenge is whether electron-electron interactions can tune such topological superconducting phases. Here, we provide experimental signatures of a unique topological superconducting phase in competition with electronic correlations in 10-unit-cell thick FeTexSe1-x films grown on SrTiO3 substrates. When the Te content x exceeds 0.7, we observe a topological transition marked by the emergence of a superconducting surface state. Near the FeTe limit, the system undergoes another transition where the surface state disappears, and superconductivity is suppressed. Theory suggests that electron-electron interactions in the odd-parity xy− band drives this second topological transition. The flattening and eventual decoherence of dxy-derived bands track the superconducting dome, linking correlation effects directly to superconducting coherent transport. Our work establishes many-body electronic correlations as a sensitive knob for tuning topology and superconductivity, offering a pathway to engineer new topological phases in correlated materials.