Enhanced third harmonic response of the PtTe$_2$ transition metal dichalcogenide
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866911434609262592 |
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| author | Villari, Leone Di Mauro Grillo, Simone Pulci, Olivia Macis, Salvatore Lupi, Stefano Marini, Andrea |
| author_facet | Villari, Leone Di Mauro Grillo, Simone Pulci, Olivia Macis, Salvatore Lupi, Stefano Marini, Andrea |
| contents | We investigate the third harmonic response of platinum ditelluride (PtTe$_2$), a Dirac semimetal belonging to the transition metal dichalcogenides class. Due to its topological properties, this material has drawn a lot of attention, particularly because it hosts type-II (super-critically tilted) Dirac fermions in the $\rm A-Γ-\rm A$ high symmetry direction. Adopting a low-energy model fitted directly from density functional theory band structure simulations, we calculate analytically the nonlinear conductivity. We observe that third-order optical nonlinearities are efficiently modulated by the cones tilting, which produces a significant enhancement of the nonlinear susceptibility. Our results, besides shedding light on topological transitions of platinum ditelluride, are relevant for future nanophotonic devices exploiting the tunable nonlinear properties of type-II Dirac fermions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_08663 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Enhanced third harmonic response of the PtTe$_2$ transition metal dichalcogenide Villari, Leone Di Mauro Grillo, Simone Pulci, Olivia Macis, Salvatore Lupi, Stefano Marini, Andrea Optics We investigate the third harmonic response of platinum ditelluride (PtTe$_2$), a Dirac semimetal belonging to the transition metal dichalcogenides class. Due to its topological properties, this material has drawn a lot of attention, particularly because it hosts type-II (super-critically tilted) Dirac fermions in the $\rm A-Γ-\rm A$ high symmetry direction. Adopting a low-energy model fitted directly from density functional theory band structure simulations, we calculate analytically the nonlinear conductivity. We observe that third-order optical nonlinearities are efficiently modulated by the cones tilting, which produces a significant enhancement of the nonlinear susceptibility. Our results, besides shedding light on topological transitions of platinum ditelluride, are relevant for future nanophotonic devices exploiting the tunable nonlinear properties of type-II Dirac fermions. |
| title | Enhanced third harmonic response of the PtTe$_2$ transition metal dichalcogenide |
| topic | Optics |
| url | https://arxiv.org/abs/2602.08663 |