2017 Fiscal Year Final Research Report
Innovation of structural materials science: Femtosecond time-resolved atomic imaging
| Project/Area Number |
24000006
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| Research Category |
Grant-in-Aid for Specially Promoted Research
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| Allocation Type | Single-year Grants |
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| Review Section |
Science and Engineering
Mathematics and Physics
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| Research Institution | Osaka University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NASU Keiichiro 高エネルギー加速器研究機構, 物構研, 名誉教授 (90114595)
YANG Jinfeng 大阪大学, 産業科学研究所, 准教授 (90362631)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKAHASHI Masahiko 東北大学, 多元物質科学研究所, 教授 (80241579)
KANASAKI Junichi 大阪大学, 産業科学研究所, 准教授 (80204535)
NARUSE Nobuyasu 滋賀医科大学, 医学部, 准教授 (30350408)
TOMITA Norikazu 山形大学, 理学部, 教授 (70290848)
ISHIDA Kunio 宇都宮大学, 大学院工学研究科, 教授 (40417100)
SHIMOI Yukihiro 産業技術総合研究所, 機能材料コンピュテーショナルデザイン研究センター, 上級研究員 (70357226)
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| Research Collaborator |
Shluger A. L. University College London, Dept. of Physics & Astronomy, Professor
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| Project Period (FY) |
2012 – 2017
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| Keywords | 光物性 / 光誘起相転移 / フェムト秒時間分解分光 / 時間分解電子回折 / 超高速キャリア動力学 |
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| Outline of Final Research Achievements |
In this research project, we aimed to obtain ultrafast real-space imaging of atomic ensembles which provides the crucial information in dynamical mechanisms of photoinduced phase transitions in solids. We adopted following three different approaches: ①solving the inverse problem for the time evolution of diffraction data using state-of-art theoretical methods, ②establishing the time-resolved electron microscopic method applicable to completely reversible processes, ③ constructing an electron microscope with fs-temporal resolution and atomic-level resolution and with a single-shot imaging capability. Developing and using these methods, we have provided far deeper insight into the physics in the ultrafast dynamics of lattice systems in laser-induced solid-to-liquid phase transformation of metals, in photoinduced transformations in charge-density-wave materials, and in initial atomic dynamics in phase-change materials. Also, the mechanism of ultrafast structural changes in warm-dense matters has been elucidated unambiguously. Furthermore, time-resolved imaging of hot electrons in energy- and momentum spaces has achieved for the first time using time-and angle-resolved photoemission spectroscopy. The achievement in the present project has greatly deepened our understanding of the ultrafast cooperative interactions of lattice systems in photoinduced phase transitions.
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| Free Research Field |
物理学・物性Ｉ
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