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| Autores principales: | , |
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| Formato: | Preprint |
| Publicado: |
2023
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| Materias: | |
| Acceso en línea: | https://arxiv.org/abs/2312.01446 |
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| _version_ | 1866913449661956096 |
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| author | Gu, Fangyuan Tangney, Paul |
| author_facet | Gu, Fangyuan Tangney, Paul |
| contents | We use molecular dynamics simulations with machine-learned atomistic force fields to simulate photoexcitation of BaTiO3 by a femtosecond laser pulse whose photon energy exceeds the optical gap. We demonstrate selective displacive excitation of coherent zone-center ferroelectric mode phonons and of the strongly anharmonic central mode. We show that the direction of P can either be reversed by a pulse in hundreds of femtoseconds or, on a longer time scale and when combined with a weak field, switched to any one of its symmetry-equivalent directions. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2312_01446 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Ultrafast polarization switching in BaTiO$_3$ by photoactivation of its ferroelectric and central modes Gu, Fangyuan Tangney, Paul Materials Science Computational Physics We use molecular dynamics simulations with machine-learned atomistic force fields to simulate photoexcitation of BaTiO3 by a femtosecond laser pulse whose photon energy exceeds the optical gap. We demonstrate selective displacive excitation of coherent zone-center ferroelectric mode phonons and of the strongly anharmonic central mode. We show that the direction of P can either be reversed by a pulse in hundreds of femtoseconds or, on a longer time scale and when combined with a weak field, switched to any one of its symmetry-equivalent directions. |
| title | Ultrafast polarization switching in BaTiO$_3$ by photoactivation of its ferroelectric and central modes |
| topic | Materials Science Computational Physics |
| url | https://arxiv.org/abs/2312.01446 |