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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2507.06550 |
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| _version_ | 1866912472909217792 |
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| author | Tanaka, Yuki Yamada, Rinsuke Sato, Manabu Hirayama, Motoaki Hirschberger, Max |
| author_facet | Tanaka, Yuki Yamada, Rinsuke Sato, Manabu Hirayama, Motoaki Hirschberger, Max |
| contents | Realization of a three-dimensional (3D) analogue of graphene has been a central challenge in topological materials science. Graphene is stabilized by covalent bonding unlike conventional spin-orbit type 3D Dirac semimetals (DSMs). In this study, we demonstrate the material realization of covalent-type 3D DSMs $R_8$Co$X_3$ stabilized by covalent bonding. We observe that the carrier mobility $μ$ of Dirac fermions reaches 3,000$\,\mathrm{cm^2/Vs}$ even in polycrystalline samples, and $μ$ increases with the inverse of the Fermi energy, evidencing significant contributions to charge transport from Dirac electrons. $R_8$Co$X_3$ provides a material platform for exploration of Dirac electrons in three dimensions with wide chemical tunability. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_06550 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Material realization of spinless, covalent-type Dirac semimetals in three dimensions Tanaka, Yuki Yamada, Rinsuke Sato, Manabu Hirayama, Motoaki Hirschberger, Max Mesoscale and Nanoscale Physics Materials Science Realization of a three-dimensional (3D) analogue of graphene has been a central challenge in topological materials science. Graphene is stabilized by covalent bonding unlike conventional spin-orbit type 3D Dirac semimetals (DSMs). In this study, we demonstrate the material realization of covalent-type 3D DSMs $R_8$Co$X_3$ stabilized by covalent bonding. We observe that the carrier mobility $μ$ of Dirac fermions reaches 3,000$\,\mathrm{cm^2/Vs}$ even in polycrystalline samples, and $μ$ increases with the inverse of the Fermi energy, evidencing significant contributions to charge transport from Dirac electrons. $R_8$Co$X_3$ provides a material platform for exploration of Dirac electrons in three dimensions with wide chemical tunability. |
| title | Material realization of spinless, covalent-type Dirac semimetals in three dimensions |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2507.06550 |