Necklace-like pattern of vortex bound states
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866912236904120320 |
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| author | Hou, Zhiyong Chen, Kailun Hong, Wenshan Wang, Da Duan, Wen Yang, Huan Li, Shiliang Luo, Huiqian Wang, Qiang-Hua Xiang, Tao Wen, Hai-Hu |
| author_facet | Hou, Zhiyong Chen, Kailun Hong, Wenshan Wang, Da Duan, Wen Yang, Huan Li, Shiliang Luo, Huiqian Wang, Qiang-Hua Xiang, Tao Wen, Hai-Hu |
| contents | Vortex is a topological defect in the superconducting condensate when a magnetic field is applied to a type-II superconductor, as elucidated by the Ginzburg-Landau theory. Due to the confinement of the quasiparticles by a vortex, it exhibits a circular shaped pattern of bound states with discrete energy levels, as predicted by the Caroli-de Gennes-Matricon theory in 1964. Here, however, we report a completely new type of vortex pattern which is necklace-like in an iron-based superconductor KCa2Fe4As4F2. Our theoretical analysis shows that this necklace-like vortex pattern arises from selective off-shell interference between vortex bound states of opposite angular momenta in the presence of rotational symmetry breaking due to disorders. This fascinating effect can be observed in a system with a small Fermi energy and wave vector, conditions fortuitously met in our samples. Our results not only disclose a novel vortex structure but also provide insights into comprehending the physics of the superconducting condensate. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_08547 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Necklace-like pattern of vortex bound states Hou, Zhiyong Chen, Kailun Hong, Wenshan Wang, Da Duan, Wen Yang, Huan Li, Shiliang Luo, Huiqian Wang, Qiang-Hua Xiang, Tao Wen, Hai-Hu Superconductivity Vortex is a topological defect in the superconducting condensate when a magnetic field is applied to a type-II superconductor, as elucidated by the Ginzburg-Landau theory. Due to the confinement of the quasiparticles by a vortex, it exhibits a circular shaped pattern of bound states with discrete energy levels, as predicted by the Caroli-de Gennes-Matricon theory in 1964. Here, however, we report a completely new type of vortex pattern which is necklace-like in an iron-based superconductor KCa2Fe4As4F2. Our theoretical analysis shows that this necklace-like vortex pattern arises from selective off-shell interference between vortex bound states of opposite angular momenta in the presence of rotational symmetry breaking due to disorders. This fascinating effect can be observed in a system with a small Fermi energy and wave vector, conditions fortuitously met in our samples. Our results not only disclose a novel vortex structure but also provide insights into comprehending the physics of the superconducting condensate. |
| title | Necklace-like pattern of vortex bound states |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2407.08547 |