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Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction
Vanadium dioxide (VO(2)) exhibits an insulator-to-metal transition accompanied by a structural transition near room temperature. This transition can be triggered by an ultrafast laser pulse. Exotic transient states, such as a metallic state without structural transition, were also proposed. These un...
Autores principales: | , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9992676/ https://www.ncbi.nlm.nih.gov/pubmed/36882433 http://dx.doi.org/10.1038/s41467-023-37000-2 |
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author | Xu, Chenhang Jin, Cheng Chen, Zijing Lu, Qi Cheng, Yun Zhang, Bo Qi, Fengfeng Chen, Jiajun Yin, Xunqing Wang, Guohua Xiang, Dao Qian, Dong |
author_facet | Xu, Chenhang Jin, Cheng Chen, Zijing Lu, Qi Cheng, Yun Zhang, Bo Qi, Fengfeng Chen, Jiajun Yin, Xunqing Wang, Guohua Xiang, Dao Qian, Dong |
author_sort | Xu, Chenhang |
collection | PubMed |
description | Vanadium dioxide (VO(2)) exhibits an insulator-to-metal transition accompanied by a structural transition near room temperature. This transition can be triggered by an ultrafast laser pulse. Exotic transient states, such as a metallic state without structural transition, were also proposed. These unique characteristics let VO(2) have great potential in thermal switchable devices and photonic applications. Although great efforts have been made, the atomic pathway during the photoinduced phase transition is still not clear. Here, we synthesize freestanding quasi-single-crystal VO(2) films and examine their photoinduced structural phase transition with mega-electron-volt ultrafast electron diffraction. Leveraging the high signal-to-noise ratio and high temporal resolution, we observe that the disappearance of vanadium dimers and zigzag chains does not coincide with the transformation of crystal symmetry. After photoexcitation, the initial structure is strongly modified within 200 femtoseconds, resulting in a transient monoclinic structure without vanadium dimers and zigzag chains. Then, it continues to evolve to the final tetragonal structure in approximately 5 picoseconds. In addition, only one laser fluence threshold instead of two thresholds suggested in polycrystalline samples is observed in our quasi-single-crystal samples. Our findings provide essential information for a comprehensive understanding of the photoinduced ultrafast phase transition in VO(2). |
format | Online Article Text |
id | pubmed-9992676 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-99926762023-03-09 Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction Xu, Chenhang Jin, Cheng Chen, Zijing Lu, Qi Cheng, Yun Zhang, Bo Qi, Fengfeng Chen, Jiajun Yin, Xunqing Wang, Guohua Xiang, Dao Qian, Dong Nat Commun Article Vanadium dioxide (VO(2)) exhibits an insulator-to-metal transition accompanied by a structural transition near room temperature. This transition can be triggered by an ultrafast laser pulse. Exotic transient states, such as a metallic state without structural transition, were also proposed. These unique characteristics let VO(2) have great potential in thermal switchable devices and photonic applications. Although great efforts have been made, the atomic pathway during the photoinduced phase transition is still not clear. Here, we synthesize freestanding quasi-single-crystal VO(2) films and examine their photoinduced structural phase transition with mega-electron-volt ultrafast electron diffraction. Leveraging the high signal-to-noise ratio and high temporal resolution, we observe that the disappearance of vanadium dimers and zigzag chains does not coincide with the transformation of crystal symmetry. After photoexcitation, the initial structure is strongly modified within 200 femtoseconds, resulting in a transient monoclinic structure without vanadium dimers and zigzag chains. Then, it continues to evolve to the final tetragonal structure in approximately 5 picoseconds. In addition, only one laser fluence threshold instead of two thresholds suggested in polycrystalline samples is observed in our quasi-single-crystal samples. Our findings provide essential information for a comprehensive understanding of the photoinduced ultrafast phase transition in VO(2). Nature Publishing Group UK 2023-03-07 /pmc/articles/PMC9992676/ /pubmed/36882433 http://dx.doi.org/10.1038/s41467-023-37000-2 Text en © The Author(s) 2023 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) . |
spellingShingle | Article Xu, Chenhang Jin, Cheng Chen, Zijing Lu, Qi Cheng, Yun Zhang, Bo Qi, Fengfeng Chen, Jiajun Yin, Xunqing Wang, Guohua Xiang, Dao Qian, Dong Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction |
title | Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction |
title_full | Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction |
title_fullStr | Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction |
title_full_unstemmed | Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction |
title_short | Transient dynamics of the phase transition in VO(2) revealed by mega-electron-volt ultrafast electron diffraction |
title_sort | transient dynamics of the phase transition in vo(2) revealed by mega-electron-volt ultrafast electron diffraction |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9992676/ https://www.ncbi.nlm.nih.gov/pubmed/36882433 http://dx.doi.org/10.1038/s41467-023-37000-2 |
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