Surface states and finite size effects in triple-fold semimetals
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866916987550040064 |
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| author | Prykhodko, A. Yu. Gorbar, E. V. Sukhachov, P. O. |
| author_facet | Prykhodko, A. Yu. Gorbar, E. V. Sukhachov, P. O. |
| contents | Triple-fold or pseudospin-1 semimetals belong to a class of multi-fold materials in which linearly dispersive bands and flat bands intersect at the same point, forming triple-fold crossing points. We conduct an analytical investigation of topologically protected Fermi arc surface states and finite-size effects in three-dimensional (3D) triple-fold and doubly degenerate triple-fold semimetals in continuum low-energy models. Higher topological charge of the triple-fold crossing points leads to two Fermi arcs connecting the nodes. For a single triple-fold crossing point, we found that no term in the Hamiltonian with momentum-independent elements can open a gap, prompting us to consider doubly-degenerate triple-fold fermions, where the gap can be opened by mixing the degenerate copies. Thin films of triple-fold semimetals allow for mixing between the surface and bulk states in addition to the discretization of energy levels of the latter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_18753 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Surface states and finite size effects in triple-fold semimetals Prykhodko, A. Yu. Gorbar, E. V. Sukhachov, P. O. Mesoscale and Nanoscale Physics Triple-fold or pseudospin-1 semimetals belong to a class of multi-fold materials in which linearly dispersive bands and flat bands intersect at the same point, forming triple-fold crossing points. We conduct an analytical investigation of topologically protected Fermi arc surface states and finite-size effects in three-dimensional (3D) triple-fold and doubly degenerate triple-fold semimetals in continuum low-energy models. Higher topological charge of the triple-fold crossing points leads to two Fermi arcs connecting the nodes. For a single triple-fold crossing point, we found that no term in the Hamiltonian with momentum-independent elements can open a gap, prompting us to consider doubly-degenerate triple-fold fermions, where the gap can be opened by mixing the degenerate copies. Thin films of triple-fold semimetals allow for mixing between the surface and bulk states in addition to the discretization of energy levels of the latter. |
| title | Surface states and finite size effects in triple-fold semimetals |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.18753 |