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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/2502.04151 |
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| _version_ | 1866912544859357184 |
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| author | Jeon, Jiwon Kim, Taehyeok Jang, Jiho Kim, Hoil Ozerov, Mykhaylo Kim, Jun Sung Min, Hongki Choi, Eunjip |
| author_facet | Jeon, Jiwon Kim, Taehyeok Jang, Jiho Kim, Hoil Ozerov, Mykhaylo Kim, Jun Sung Min, Hongki Choi, Eunjip |
| contents | We investigate the quasiparticles of a single nodal ring semimetal SrAs$_3$ through axis-resolved magneto-optical measurements. We observe three types of Landau levels scaling as $\varepsilon \sim \sqrt{B}$, $\varepsilon \sim B^{2/3}$, and $\varepsilon \sim B$ that correspond to Dirac, semi-Dirac, and classical fermions, respectively. Through theoretical analysis, we identify the distinct origins of these three types of fermions present within the nodal ring. In particular, semi-Dirac fermions--a novel type of fermion that can give rise to a range of unique quantum phenomena--emerge from the endpoints of the nodal ring where the energy band disperses linearly along one direction and quadratically along the perpendicular direction, a feature not achievable in nodal point or line structures. The capacity of the nodal ring to simultaneously host multiple fermion types, including semi-Dirac fermions, establishes it as a valuable platform to expand the understanding of topological semimetals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04151 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Unveiling three types of fermions in a nodal ring topological semimetal through magneto-optical transitions Jeon, Jiwon Kim, Taehyeok Jang, Jiho Kim, Hoil Ozerov, Mykhaylo Kim, Jun Sung Min, Hongki Choi, Eunjip Materials Science We investigate the quasiparticles of a single nodal ring semimetal SrAs$_3$ through axis-resolved magneto-optical measurements. We observe three types of Landau levels scaling as $\varepsilon \sim \sqrt{B}$, $\varepsilon \sim B^{2/3}$, and $\varepsilon \sim B$ that correspond to Dirac, semi-Dirac, and classical fermions, respectively. Through theoretical analysis, we identify the distinct origins of these three types of fermions present within the nodal ring. In particular, semi-Dirac fermions--a novel type of fermion that can give rise to a range of unique quantum phenomena--emerge from the endpoints of the nodal ring where the energy band disperses linearly along one direction and quadratically along the perpendicular direction, a feature not achievable in nodal point or line structures. The capacity of the nodal ring to simultaneously host multiple fermion types, including semi-Dirac fermions, establishes it as a valuable platform to expand the understanding of topological semimetals. |
| title | Unveiling three types of fermions in a nodal ring topological semimetal through magneto-optical transitions |
| topic | Materials Science |
| url | https://arxiv.org/abs/2502.04151 |