The optical absorption in indirect semiconductor to semimetal PtSe2 arises from direct transitions
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arXiv
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| Hauptverfasser: | , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2023
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| author | Tharrault, Marin Ayari, Sabrine Arfaoui, Mehdi Desgué, Eva Goff, Romaric Le Morfin, Pascal Palomo, José Rosticher, Michael Jaziri, Sihem Plaçais, Bernard Legagneux, Pierre Carosella, Francesca Voisin, Christophe Ferreira, Robson Baudin, Emmanuel |
| author_facet | Tharrault, Marin Ayari, Sabrine Arfaoui, Mehdi Desgué, Eva Goff, Romaric Le Morfin, Pascal Palomo, José Rosticher, Michael Jaziri, Sihem Plaçais, Bernard Legagneux, Pierre Carosella, Francesca Voisin, Christophe Ferreira, Robson Baudin, Emmanuel |
| contents | $\rm{PtSe_2}$ is a van der Waals material transitioning from an indirect bandgap semiconductor to a semimetal with increasing thickness. Its absorption threshold has been conjectured to originate from interband indirect transitions. By quantitative comparison between broadband ($0.8 - 3.0\,\rm{eV}$) optical absorption of high-quality exfoliated crystals and DFT ab-initio simulations, we prove instead that the optical absorption arises only from direct transitions. This understanding allows us to shed light on the semiconductor to semimetal transition and to explore the effect of stacking and excitons on the optical absorption. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_01847 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | The optical absorption in indirect semiconductor to semimetal PtSe2 arises from direct transitions Tharrault, Marin Ayari, Sabrine Arfaoui, Mehdi Desgué, Eva Goff, Romaric Le Morfin, Pascal Palomo, José Rosticher, Michael Jaziri, Sihem Plaçais, Bernard Legagneux, Pierre Carosella, Francesca Voisin, Christophe Ferreira, Robson Baudin, Emmanuel Materials Science Mesoscale and Nanoscale Physics $\rm{PtSe_2}$ is a van der Waals material transitioning from an indirect bandgap semiconductor to a semimetal with increasing thickness. Its absorption threshold has been conjectured to originate from interband indirect transitions. By quantitative comparison between broadband ($0.8 - 3.0\,\rm{eV}$) optical absorption of high-quality exfoliated crystals and DFT ab-initio simulations, we prove instead that the optical absorption arises only from direct transitions. This understanding allows us to shed light on the semiconductor to semimetal transition and to explore the effect of stacking and excitons on the optical absorption. |
| title | The optical absorption in indirect semiconductor to semimetal PtSe2 arises from direct transitions |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2311.01847 |