Deep-lying semi-Dirac fermions in hexagonal close-packed cadmium
Fuente:
arXiv
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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866909898799841280 |
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| author | Subedi, Alaska Behnia, Kamran |
| author_facet | Subedi, Alaska Behnia, Kamran |
| contents | Semi-Dirac fermions are massless in one direction and massive in the perpendicular directions. Such quasiparticles have been proposed in various contexts in condensed matter. Using first principles calculations, we identify a pair of semi-Dirac bands anti-crossing at $-3$ eV below the Fermi level in the electronic structure of hexagonal close-packed cadmium. The linear out-of-plane dispersion is kept up to the Fermi level. We demonstrate that the dichotomy between the linear and quadratic dispersions is driven by an orientation-sensitive hybridization between the $s$ and $p_z$ orbitals. The upper semi-Dirac band produces a lens-shaped nonellipsoidal Fermi sheet whose cross-section area has a $k$-dependence that is in excellent agreement with the experimentally measured period of Sondheimer oscillations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_11585 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Deep-lying semi-Dirac fermions in hexagonal close-packed cadmium Subedi, Alaska Behnia, Kamran Materials Science Mesoscale and Nanoscale Physics Statistical Mechanics Semi-Dirac fermions are massless in one direction and massive in the perpendicular directions. Such quasiparticles have been proposed in various contexts in condensed matter. Using first principles calculations, we identify a pair of semi-Dirac bands anti-crossing at $-3$ eV below the Fermi level in the electronic structure of hexagonal close-packed cadmium. The linear out-of-plane dispersion is kept up to the Fermi level. We demonstrate that the dichotomy between the linear and quadratic dispersions is driven by an orientation-sensitive hybridization between the $s$ and $p_z$ orbitals. The upper semi-Dirac band produces a lens-shaped nonellipsoidal Fermi sheet whose cross-section area has a $k$-dependence that is in excellent agreement with the experimentally measured period of Sondheimer oscillations. |
| title | Deep-lying semi-Dirac fermions in hexagonal close-packed cadmium |
| topic | Materials Science Mesoscale and Nanoscale Physics Statistical Mechanics |
| url | https://arxiv.org/abs/2411.11585 |