2022 Fiscal Year Final Research Report
High-harmonic generation in strongly correlated materials driven by a single-cycle strong infrared pulse
| Project/Area Number |
20K03800
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | Tohoku University |
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Principal Investigator |
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 高次高調波発生 / 強相関電子系 / 超伝導体 / 非線形分光 / フーリエ分光 / 時間分解分光 / 単一サイクル赤外光 / キャリアエンベロープ位相 |
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| Outline of Final Research Achievements |
High-harmonic generation in strongly correlated materials has been investigated using a carrier-envelope phase (CEP) controlled single-cycle strong infrared pulse. As an experimental method, precise measurement technique of ultrabroadband spectra has been developed. In an organic superconductor k-type ET salt, we have observed second harmonic generation reflecting polarized petahertz nonlinear current driven by a single-cycle strong light field. In a high-temperature superconductor YBCO, polarization dependent 5th harmonic generation probably shows femto/atto-second carrier dynamics in CuO2 plane and CuO chain. In an organic electronic ferroelectric alpha-type ET salt, we have observed ultrafast (<500 fs) complete suppression of second harmonic generation triggered by photoinduced charge ordered insulator to metal transition.
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| Free Research Field |
光物性物理学
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| Academic Significance and Societal Importance of the Research Achievements |
高次高調波発生は固体の超高速キャリアダイナミクスを調べる新しい手法として注目を集めている。半導体や絶縁体を中心に展開されているこの手法を強相関電子系に適用し、非従来型超伝導や電子強誘電など、強相関系特有の電子物性の微視的起源の解明と超高速光操作の検証を目指した。得られた成果は次世代の強相関光エレクトロニクスの開拓に貢献できる。また、本研究のために開発した精密分光技術は高調波測定以外にも適用可能であり、赤外分光やラマン分光などの広範な分光測定の発展に寄与できる。
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