Nonlinear phononics in LaFeAsO: Optical control of the crystal structure toward possible enhancement of superconductivity
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866914457476661248 |
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| author | Kamiyama, Shu Kaneko, Tatsuya Kuroki, Kazuhiko Ochi, Masayuki |
| author_facet | Kamiyama, Shu Kaneko, Tatsuya Kuroki, Kazuhiko Ochi, Masayuki |
| contents | Nonlinear phononics provides a route to control crystal structures through light-induced phonon excitation. In this study, we apply nonlinear phononics to an iron-based superconductor, LaFeAsO, with the aim of tuning its crystal structure toward the ideal one to enhance superconductivity. We simulate light-induced phonon dynamics on the anharmonic lattice potential determined by first-principles calculations. We find that the anion height $h$, a key structural parameter in iron-based superconductors, approaches its ideal value when an appropriate infrared-active phonon mode is selectively excited. This result suggests the possibility of controlling crystal structures and enhancing superconductivity in iron-based superconductors based on the concept of nonlinear phononics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_06745 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nonlinear phononics in LaFeAsO: Optical control of the crystal structure toward possible enhancement of superconductivity Kamiyama, Shu Kaneko, Tatsuya Kuroki, Kazuhiko Ochi, Masayuki Superconductivity Materials Science Strongly Correlated Electrons Optics Nonlinear phononics provides a route to control crystal structures through light-induced phonon excitation. In this study, we apply nonlinear phononics to an iron-based superconductor, LaFeAsO, with the aim of tuning its crystal structure toward the ideal one to enhance superconductivity. We simulate light-induced phonon dynamics on the anharmonic lattice potential determined by first-principles calculations. We find that the anion height $h$, a key structural parameter in iron-based superconductors, approaches its ideal value when an appropriate infrared-active phonon mode is selectively excited. This result suggests the possibility of controlling crystal structures and enhancing superconductivity in iron-based superconductors based on the concept of nonlinear phononics. |
| title | Nonlinear phononics in LaFeAsO: Optical control of the crystal structure toward possible enhancement of superconductivity |
| topic | Superconductivity Materials Science Strongly Correlated Electrons Optics |
| url | https://arxiv.org/abs/2604.06745 |