Optimizing optical properties of bilayer PtSe$_2$: the role of twist angle and hydrostatic pressure
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866911007051350016 |
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| author | Jureczko, Paulina Dendzik, Zbigniew Kurpas, Marcin |
| author_facet | Jureczko, Paulina Dendzik, Zbigniew Kurpas, Marcin |
| contents | Two-dimensional van der Waals materials offer exceptional tunability in their electronic properties. In this paper, we explore how twisting and hydrostatic pressure can be leveraged to engineer the electronic and optical characteristics of bilayer PtSe$_2$. Using state-of-the-art first-principles density functional methods, we calculate the electronic band structure and the imaginary part of the dielectric function across multiple twist angles and pressure values. We find, that at the twist angle $θ=13.17^\circ$, bilayer PtSe$_2$, which is intrinsically an indirect semiconductor, transforms into a direct-gap semiconductor. Moreover, we demonstrate that hydrostatic out-of-plane pressure boosts near-infrared optical activity, further expanding the functional potential of PtSe$_2$ bilayers. The demonstrated high tunability of electronic and optical properties by twisting and pressure opens new application directions of PtSe$_2$ in optoelectronics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_12746 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optimizing optical properties of bilayer PtSe$_2$: the role of twist angle and hydrostatic pressure Jureczko, Paulina Dendzik, Zbigniew Kurpas, Marcin Materials Science Mesoscale and Nanoscale Physics Two-dimensional van der Waals materials offer exceptional tunability in their electronic properties. In this paper, we explore how twisting and hydrostatic pressure can be leveraged to engineer the electronic and optical characteristics of bilayer PtSe$_2$. Using state-of-the-art first-principles density functional methods, we calculate the electronic band structure and the imaginary part of the dielectric function across multiple twist angles and pressure values. We find, that at the twist angle $θ=13.17^\circ$, bilayer PtSe$_2$, which is intrinsically an indirect semiconductor, transforms into a direct-gap semiconductor. Moreover, we demonstrate that hydrostatic out-of-plane pressure boosts near-infrared optical activity, further expanding the functional potential of PtSe$_2$ bilayers. The demonstrated high tunability of electronic and optical properties by twisting and pressure opens new application directions of PtSe$_2$ in optoelectronics. |
| title | Optimizing optical properties of bilayer PtSe$_2$: the role of twist angle and hydrostatic pressure |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2506.12746 |