Observation of in-gap states in a two-dimensional CrI2/NbSe2 heterostructure
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929436241166336 |
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| author | Li, Peigen Zhang, Jihai Zhu, Di Chen, Cui-Qun Yi, Enkui Shen, Bing Hou, Yusheng Yan, Zhongbo Yao, Dao-Xin Guo, Donghui Zhong, Dingyong |
| author_facet | Li, Peigen Zhang, Jihai Zhu, Di Chen, Cui-Qun Yi, Enkui Shen, Bing Hou, Yusheng Yan, Zhongbo Yao, Dao-Xin Guo, Donghui Zhong, Dingyong |
| contents | Low-dimensional magnetic structures coupled with superconductors are promising platforms for realizing Majorana zero modes, which have potential applications in topological quantum computing. Here, we report a two-dimensional (2D) magnetic-superconducting heterostructure consisting of single-layer chromium diiodide (CrI2) on a niobium diselenide (NbSe2) superconductor. Single-layer CrI2 nanosheets, which hold antiferromagnetic (AFM) ground states by our first-principles calculations, were epitaxially grown on the layered NbSe2 substrate. Using scanning tunneling microscopy/spectroscopy, we observed robust in-gap states spatially located at the edge of the nanosheets and defect-induced zero-energy peaks inside the CrI2 nanosheets. Magnetic-flux vortices induced by an external field exhibit broken threefold rotational symmetry of pristine NbSe2 superconductor, implying the efficient modulation of the interfacial superconducting states by the epitaxial CrI2 layer. A phenomenological model suggests the existence of chiral edge states in a 2D AFM-superconducting hybrid system with an even Chern number, providing a qualitatively plausible understanding for our experimental observation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_06215 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Observation of in-gap states in a two-dimensional CrI2/NbSe2 heterostructure Li, Peigen Zhang, Jihai Zhu, Di Chen, Cui-Qun Yi, Enkui Shen, Bing Hou, Yusheng Yan, Zhongbo Yao, Dao-Xin Guo, Donghui Zhong, Dingyong Superconductivity Mesoscale and Nanoscale Physics Low-dimensional magnetic structures coupled with superconductors are promising platforms for realizing Majorana zero modes, which have potential applications in topological quantum computing. Here, we report a two-dimensional (2D) magnetic-superconducting heterostructure consisting of single-layer chromium diiodide (CrI2) on a niobium diselenide (NbSe2) superconductor. Single-layer CrI2 nanosheets, which hold antiferromagnetic (AFM) ground states by our first-principles calculations, were epitaxially grown on the layered NbSe2 substrate. Using scanning tunneling microscopy/spectroscopy, we observed robust in-gap states spatially located at the edge of the nanosheets and defect-induced zero-energy peaks inside the CrI2 nanosheets. Magnetic-flux vortices induced by an external field exhibit broken threefold rotational symmetry of pristine NbSe2 superconductor, implying the efficient modulation of the interfacial superconducting states by the epitaxial CrI2 layer. A phenomenological model suggests the existence of chiral edge states in a 2D AFM-superconducting hybrid system with an even Chern number, providing a qualitatively plausible understanding for our experimental observation. |
| title | Observation of in-gap states in a two-dimensional CrI2/NbSe2 heterostructure |
| topic | Superconductivity Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2403.06215 |