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| Autores principales: | , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2401.10424 |
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| _version_ | 1866911490630483968 |
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| author | Coe, Aaron Zhu, Zhi-Huai He, Yang Kim, Dae-Jeong Fisk, Zachary Hoffman, Jason Hoffman, Jennifer |
| author_facet | Coe, Aaron Zhu, Zhi-Huai He, Yang Kim, Dae-Jeong Fisk, Zachary Hoffman, Jason Hoffman, Jennifer |
| contents | YbB$_6$ is a predicted topological insulator, with experimental evidence for conducting surface states of yet-unproven origin. However, its lack of a natural cleavage plane, and resultant surface-dependent polarity, has obscured its study. We use scanning tunneling microscopy to image the cleaved surface of YbB$_6$, exhibiting several coexisting terminations with distinct atomic structures. Our spectroscopic measurements show band-bending between the terminations, resulting in both conducting and fully-gapped regions. In the conductive regions, we observe spectral peaks that are suggestive of van Hove singularities arising from Rashba spin-split quantum well states. The insulating regions rule out the possibility that YbB$_6$ is a strong topological insulator, while the spin-polarized conducting regions suggest possible utility for spintronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_10424 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Nanoscale Conducting and Insulating Domains on YbB$_6$ Coe, Aaron Zhu, Zhi-Huai He, Yang Kim, Dae-Jeong Fisk, Zachary Hoffman, Jason Hoffman, Jennifer Mesoscale and Nanoscale Physics YbB$_6$ is a predicted topological insulator, with experimental evidence for conducting surface states of yet-unproven origin. However, its lack of a natural cleavage plane, and resultant surface-dependent polarity, has obscured its study. We use scanning tunneling microscopy to image the cleaved surface of YbB$_6$, exhibiting several coexisting terminations with distinct atomic structures. Our spectroscopic measurements show band-bending between the terminations, resulting in both conducting and fully-gapped regions. In the conductive regions, we observe spectral peaks that are suggestive of van Hove singularities arising from Rashba spin-split quantum well states. The insulating regions rule out the possibility that YbB$_6$ is a strong topological insulator, while the spin-polarized conducting regions suggest possible utility for spintronic devices. |
| title | Nanoscale Conducting and Insulating Domains on YbB$_6$ |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2401.10424 |