Terahertz-field activation of polar skyrons
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866908594985762816 |
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| author | Wang, Huaiyu Stoica, Vladimir Dai, Cheng Paściak, Marek Das, Sujit Yang, Tiannan Gonçalves, Mauro A. P. Kulda, Jiri McCarter, Margaret R. Mangu, Anudeep Cao, Yue Padma, Hari Saha, Utkarsh Zhu, Diling Sato, Takahiro Song, Sanghoon Hoffmann, Mathias Kramer, Patrick Nelson, Silke Sun, Yanwen Nguyen, Quynh Zhang, Zhan Ramesh, Ramamoorthy Martin, Lane Lindenberg, Aaron M. Chen, Long-Qing Freeland, John W. Hlinka, Jirka Gopalan, Venkatraman Wen, Haidan |
| author_facet | Wang, Huaiyu Stoica, Vladimir Dai, Cheng Paściak, Marek Das, Sujit Yang, Tiannan Gonçalves, Mauro A. P. Kulda, Jiri McCarter, Margaret R. Mangu, Anudeep Cao, Yue Padma, Hari Saha, Utkarsh Zhu, Diling Sato, Takahiro Song, Sanghoon Hoffmann, Mathias Kramer, Patrick Nelson, Silke Sun, Yanwen Nguyen, Quynh Zhang, Zhan Ramesh, Ramamoorthy Martin, Lane Lindenberg, Aaron M. Chen, Long-Qing Freeland, John W. Hlinka, Jirka Gopalan, Venkatraman Wen, Haidan |
| contents | Unraveling collective modes arising from coupled degrees of freedom is crucial for understanding complex interactions in solids and developing new functionalities. Unique collective behaviors emerge when two degrees of freedom, ordered on distinct length scales, interact. Polar skyrmions, three-dimensional electric polarization textures in ferroelectric superlattices, disrupt the lattice continuity at the nanometer scale with nontrivial topology, leading to previously unexplored collective modes. Here, using terahertz-field excitation and femtosecond x-ray diffraction, we discovered subterahertz collective modes, dubbed 'skyrons', which appear as swirling patterns of atomic displacements functioning as atomic-scale gearsets. Momentum-resolved time-domain measurements of diffuse scattering revealed an avoided crossing in the dispersion relation of skyrons. We further demonstrated that the amplitude and dispersion of skyrons can be controlled by sample temperature and electric-field bias. Atomistic simulations and dynamical phase-field modeling provided microscopic insights into the three-dimensional crystallographic and polarization dynamics. The discovery of skyrons and their coupling with terahertz fields opens avenues for ultrafast control of topological polar structures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_09958 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Terahertz-field activation of polar skyrons Wang, Huaiyu Stoica, Vladimir Dai, Cheng Paściak, Marek Das, Sujit Yang, Tiannan Gonçalves, Mauro A. P. Kulda, Jiri McCarter, Margaret R. Mangu, Anudeep Cao, Yue Padma, Hari Saha, Utkarsh Zhu, Diling Sato, Takahiro Song, Sanghoon Hoffmann, Mathias Kramer, Patrick Nelson, Silke Sun, Yanwen Nguyen, Quynh Zhang, Zhan Ramesh, Ramamoorthy Martin, Lane Lindenberg, Aaron M. Chen, Long-Qing Freeland, John W. Hlinka, Jirka Gopalan, Venkatraman Wen, Haidan Materials Science Applied Physics Unraveling collective modes arising from coupled degrees of freedom is crucial for understanding complex interactions in solids and developing new functionalities. Unique collective behaviors emerge when two degrees of freedom, ordered on distinct length scales, interact. Polar skyrmions, three-dimensional electric polarization textures in ferroelectric superlattices, disrupt the lattice continuity at the nanometer scale with nontrivial topology, leading to previously unexplored collective modes. Here, using terahertz-field excitation and femtosecond x-ray diffraction, we discovered subterahertz collective modes, dubbed 'skyrons', which appear as swirling patterns of atomic displacements functioning as atomic-scale gearsets. Momentum-resolved time-domain measurements of diffuse scattering revealed an avoided crossing in the dispersion relation of skyrons. We further demonstrated that the amplitude and dispersion of skyrons can be controlled by sample temperature and electric-field bias. Atomistic simulations and dynamical phase-field modeling provided microscopic insights into the three-dimensional crystallographic and polarization dynamics. The discovery of skyrons and their coupling with terahertz fields opens avenues for ultrafast control of topological polar structures. |
| title | Terahertz-field activation of polar skyrons |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2505.09958 |