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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2410.09238 |
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| _version_ | 1866912071320338432 |
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| author | Huang, Chun-Ying Chica, Daniel G. Cui, Zhi-Hao Handa, Taketo Thinel, Morgan Olsen, Nicholas Liu, Yufeng Ziebel, Michael E. He, Guiying Shao, Yinming Occhialini, Connor A. Pelliciari, Jonathan Basov, Dmitri N. Sfeir, Matthew Pasupathy, Abhay Bisogni, Valentina Reichman, David R. Roy, Xavier Zhu, Xiaoyang |
| author_facet | Huang, Chun-Ying Chica, Daniel G. Cui, Zhi-Hao Handa, Taketo Thinel, Morgan Olsen, Nicholas Liu, Yufeng Ziebel, Michael E. He, Guiying Shao, Yinming Occhialini, Connor A. Pelliciari, Jonathan Basov, Dmitri N. Sfeir, Matthew Pasupathy, Abhay Bisogni, Valentina Reichman, David R. Roy, Xavier Zhu, Xiaoyang |
| contents | A ferroelectric material often exhibits a soft transvers optical (TO) phonon mode which governs it phase transition. Charge coupling to this ferroelectric soft mode may further mediate emergent physical properties, including superconductivity and defect tolerance. However, direct experimental evidence for such coupling is scarce. Here we show that a photo-launched coherent phonon couples strongly to electronic transitions across the bandgap in the van der Waals (vdW) two-dimensional (2D) ferroelectric semiconductor NbOI2. Using terahertz time-domain spectroscopy and first-principles calculations, we identify this mode as the TO phonon responsible for ferroelectric order. This exclusive coupling occurs only with above-gap electronic transition and is absent in the valence band as revealed by resonant inelastic X-ray scattering. Our findings suggest a new role of the soft TO phonon mode in electronic and optical properties of ferroelectric semiconductors. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_09238 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coupling of Electronic Transitions to Ferroelectric Order in a 2D Semiconductor Huang, Chun-Ying Chica, Daniel G. Cui, Zhi-Hao Handa, Taketo Thinel, Morgan Olsen, Nicholas Liu, Yufeng Ziebel, Michael E. He, Guiying Shao, Yinming Occhialini, Connor A. Pelliciari, Jonathan Basov, Dmitri N. Sfeir, Matthew Pasupathy, Abhay Bisogni, Valentina Reichman, David R. Roy, Xavier Zhu, Xiaoyang Materials Science Mesoscale and Nanoscale Physics A ferroelectric material often exhibits a soft transvers optical (TO) phonon mode which governs it phase transition. Charge coupling to this ferroelectric soft mode may further mediate emergent physical properties, including superconductivity and defect tolerance. However, direct experimental evidence for such coupling is scarce. Here we show that a photo-launched coherent phonon couples strongly to electronic transitions across the bandgap in the van der Waals (vdW) two-dimensional (2D) ferroelectric semiconductor NbOI2. Using terahertz time-domain spectroscopy and first-principles calculations, we identify this mode as the TO phonon responsible for ferroelectric order. This exclusive coupling occurs only with above-gap electronic transition and is absent in the valence band as revealed by resonant inelastic X-ray scattering. Our findings suggest a new role of the soft TO phonon mode in electronic and optical properties of ferroelectric semiconductors. |
| title | Coupling of Electronic Transitions to Ferroelectric Order in a 2D Semiconductor |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2410.09238 |