Observation of Half-Quantum Vorticity in an Iron-based Superconductor
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866916717867827200 |
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| author | Balakan, Mohammad Javadi Gu, Genda Li, Qiang Watanabe, Kenji Taniguchi, Takashi Lee, Ji Ung |
| author_facet | Balakan, Mohammad Javadi Gu, Genda Li, Qiang Watanabe, Kenji Taniguchi, Takashi Lee, Ji Ung |
| contents | Half-quantum vortices -- topological excitations carrying half the superconducting flux quantum -- are predicted to emerge in spin-triplet superconductors, where the spin component of order parameter enables fractional flux quantization. We present direct transport signatures of half-quantum vorticity in single-crystal Fe(Te,Se), an iron-based superconductor with helical Dirac surface states. Using mesoscopic superconducting ring devices, we observe half-integer quantum oscillations arising from the splitting of quantized fluxoid states, further supported by distinct signatures of trapped half-integer fluxoids. The quantum oscillations are modulated by a background symmetry, set by the relative orientation of the DC bias current and perpendicular magnetic field, consistent with strong spin-orbit coupling. These findings demonstrate the long-sought half-quantum vorticity in spin-polarized superconductors and open new directions toward non-Abelian excitations in quantum materials and scalable topological qubits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_01522 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of Half-Quantum Vorticity in an Iron-based Superconductor Balakan, Mohammad Javadi Gu, Genda Li, Qiang Watanabe, Kenji Taniguchi, Takashi Lee, Ji Ung Superconductivity Strongly Correlated Electrons Half-quantum vortices -- topological excitations carrying half the superconducting flux quantum -- are predicted to emerge in spin-triplet superconductors, where the spin component of order parameter enables fractional flux quantization. We present direct transport signatures of half-quantum vorticity in single-crystal Fe(Te,Se), an iron-based superconductor with helical Dirac surface states. Using mesoscopic superconducting ring devices, we observe half-integer quantum oscillations arising from the splitting of quantized fluxoid states, further supported by distinct signatures of trapped half-integer fluxoids. The quantum oscillations are modulated by a background symmetry, set by the relative orientation of the DC bias current and perpendicular magnetic field, consistent with strong spin-orbit coupling. These findings demonstrate the long-sought half-quantum vorticity in spin-polarized superconductors and open new directions toward non-Abelian excitations in quantum materials and scalable topological qubits. |
| title | Observation of Half-Quantum Vorticity in an Iron-based Superconductor |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2505.01522 |