Resonant Structure of Second Harmonic Generation in Multilayer Graphene Polytypes
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908907670077440 |
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| author | Sarsfield, Patrick Johansen Joya, Takaaki V. Kawakami, Takuto Koshino, Mikito Fal'ko, Vladimir |
| author_facet | Sarsfield, Patrick Johansen Joya, Takaaki V. Kawakami, Takuto Koshino, Mikito Fal'ko, Vladimir |
| contents | Second harmonic generation (SHG) is a powerful optical tool for identifying non-centrosymmetric crystalline structures. Here, we analyze SHG in multilayer graphenes (MLG), with a focus on its dependence on the stacking order, encapsulation environment and biasing which break inversion symmetry in multilayers, as well as the SHG sensitivity to the electron-hole asymmetry in the MLG spectra and doping. In particular, we identify stacking-order-dependent resonant features in the SHG spectra for trilayers and tetralayers, suggesting that infra-red range SHG offers a non-invasive characterization method for distinguishing between MLG polytypes, as well as optical identification of crystallographic direction in MLG films. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_15668 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Resonant Structure of Second Harmonic Generation in Multilayer Graphene Polytypes Sarsfield, Patrick Johansen Joya, Takaaki V. Kawakami, Takuto Koshino, Mikito Fal'ko, Vladimir Mesoscale and Nanoscale Physics Second harmonic generation (SHG) is a powerful optical tool for identifying non-centrosymmetric crystalline structures. Here, we analyze SHG in multilayer graphenes (MLG), with a focus on its dependence on the stacking order, encapsulation environment and biasing which break inversion symmetry in multilayers, as well as the SHG sensitivity to the electron-hole asymmetry in the MLG spectra and doping. In particular, we identify stacking-order-dependent resonant features in the SHG spectra for trilayers and tetralayers, suggesting that infra-red range SHG offers a non-invasive characterization method for distinguishing between MLG polytypes, as well as optical identification of crystallographic direction in MLG films. |
| title | Resonant Structure of Second Harmonic Generation in Multilayer Graphene Polytypes |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2508.15668 |