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<p>UTe<sub>2</sub> is a candidate spin-triplet superconductor, yet its superconducting state remains debated. Using scanning tunneling microscopy/spectroscopy, we observe a novel magnetic vortex with distinct dark-bright contrast in local density of states on UTe<sub>2</sub> (011) surface under perpendicular magnetic fields, resembling the Yin-Yang diagram in Taoism. Each vortex carries a quantized magnetic flux, and the boundary between the two parts aligns with crystallographic <i>a</i>-axis. The vortex states exhibit intriguing behaviors –– the Yang part exhibits a sharp zero-energy conductance peak, whereas the Yin part shows a superconducting gap with pronounced coherence peaks, sharper than those without fields. Theoretical analysis attributes this pattern to vortex-induced asymmetric suppression of topological surface states caused by the tilted Fermi surface, constraining possible d-vector orientations. Our findings constitute distinctive evidence for spin-triplet pairing in UTe<sub>2</sub>, and provide new avenues for exploring the interplay between surface states and vortex-bound states in topological superconductors.</p>

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Yin-Yang vortex on UTe2 (011) surface

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月18日

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  • Ruotong Yin,
  • Yuanji Li,
  • Zengyi Du,
  • Dengpeng Yuan,
  • Shiyuan Wang,
  • Jiashuo Gong,
  • Mingzhe Li,
  • Ziyuan Chen,
  • Jiakang Zhang,
  • Yuguang Wang,
  • Ziwei Xue,
  • Xinchun Lai,
  • Shiyong Tan,
  • Da Wang,
  • Qiang-Hua Wang,
  • Dong-Lai Feng,
  • Ya-Jun Yan

摘要

UTe2 is a candidate spin-triplet superconductor, yet its superconducting state remains debated. Using scanning tunneling microscopy/spectroscopy, we observe a novel magnetic vortex with distinct dark-bright contrast in local density of states on UTe2 (011) surface under perpendicular magnetic fields, resembling the Yin-Yang diagram in Taoism. Each vortex carries a quantized magnetic flux, and the boundary between the two parts aligns with crystallographic a-axis. The vortex states exhibit intriguing behaviors –– the Yang part exhibits a sharp zero-energy conductance peak, whereas the Yin part shows a superconducting gap with pronounced coherence peaks, sharper than those without fields. Theoretical analysis attributes this pattern to vortex-induced asymmetric suppression of topological surface states caused by the tilted Fermi surface, constraining possible d-vector orientations. Our findings constitute distinctive evidence for spin-triplet pairing in UTe2, and provide new avenues for exploring the interplay between surface states and vortex-bound states in topological superconductors.