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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2503.21506 |
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| _version_ | 1866908373228716032 |
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| author | Yin, Ruotong Li, Yuanji Du, Zengyi Yuan, Dengpeng Wang, Shiyuan Gong, Jiashuo Li, Mingzhe Chen, Ziyuan Zhang, Jiakang Wang, Yuguang Xue, Ziwei Lai, Xinchun Tan, Shiyong Wang, Da Wang, Qiang-Hua Feng, Dong-Lai Yan, Ya-Jun |
| author_facet | Yin, Ruotong Li, Yuanji Du, Zengyi Yuan, Dengpeng Wang, Shiyuan Gong, Jiashuo Li, Mingzhe Chen, Ziyuan Zhang, Jiakang Wang, Yuguang Xue, Ziwei Lai, Xinchun Tan, Shiyong Wang, Da Wang, Qiang-Hua Feng, Dong-Lai Yan, Ya-Jun |
| contents | UTe2 is a promising candidate for spin-triplet superconductor, yet its exact superconducting order parameter remains highly debated. Here, via scanning tunneling microscopy/spectroscopy, we observe a novel type of magnetic vortex with distinct dark-bright contrast in local density of states on UTe2 (011) surface under a perpendicular magnetic field, resembling the conjugate structure of Yin-Yang diagram in Taoism. Each Yin-Yang vortex contains a quantized magnetic flux, and the boundary between the Yin and Yang parts aligns with the crystallographic a-axis of UTe2. The vortex states exhibit intriguing behaviors -- a sharp zero-energy conductance peak exists at the Yang part, while a superconducting gap with pronounced coherence peaks exists at the Yin part, which is even sharper than those measured far from the vortex core or in the absence of magnetic field. By theoretical modeling, we show that the Yin-Yang vortices on UTe2 (011) surface can be explained by the asymmetric vortex-derived local distortion of the zero-energy surface states associated with spin-triplet pairing with appropriate d-vectors. Therefore, the observation of Yin-Yang vortex confirms the spin-triplet pairing in UTe2 and imposes constraints on the candidate d-vector for the spin-triplet pairing. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_21506 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Yin-Yang vortex on UTe2 (011) surface Yin, Ruotong Li, Yuanji Du, Zengyi Yuan, Dengpeng Wang, Shiyuan Gong, Jiashuo Li, Mingzhe Chen, Ziyuan Zhang, Jiakang Wang, Yuguang Xue, Ziwei Lai, Xinchun Tan, Shiyong Wang, Da Wang, Qiang-Hua Feng, Dong-Lai Yan, Ya-Jun Superconductivity UTe2 is a promising candidate for spin-triplet superconductor, yet its exact superconducting order parameter remains highly debated. Here, via scanning tunneling microscopy/spectroscopy, we observe a novel type of magnetic vortex with distinct dark-bright contrast in local density of states on UTe2 (011) surface under a perpendicular magnetic field, resembling the conjugate structure of Yin-Yang diagram in Taoism. Each Yin-Yang vortex contains a quantized magnetic flux, and the boundary between the Yin and Yang parts aligns with the crystallographic a-axis of UTe2. The vortex states exhibit intriguing behaviors -- a sharp zero-energy conductance peak exists at the Yang part, while a superconducting gap with pronounced coherence peaks exists at the Yin part, which is even sharper than those measured far from the vortex core or in the absence of magnetic field. By theoretical modeling, we show that the Yin-Yang vortices on UTe2 (011) surface can be explained by the asymmetric vortex-derived local distortion of the zero-energy surface states associated with spin-triplet pairing with appropriate d-vectors. Therefore, the observation of Yin-Yang vortex confirms the spin-triplet pairing in UTe2 and imposes constraints on the candidate d-vector for the spin-triplet pairing. |
| title | Yin-Yang vortex on UTe2 (011) surface |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2503.21506 |