2022 Fiscal Year Final Research Report
Attosecond manipulation of electron tunneling at nanoscales
| Project/Area Number |
20H02653
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Basic Section 30020:Optical engineering and photon science-related
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| Research Institution | Yokohama National University |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
桂川 眞幸 電気通信大学, 大学院情報理工学研究科, 教授 (10251711)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | 走査トンネル顕微鏡 / アト秒 / 光電場 / 光励起状態 / フォノン / 原子層物質 |
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| Outline of Final Research Achievements |
In this project, we aim at demonstrating the light-field induced tunneling current by combining the scanning tunneling microscope with the ultra-high repetition rate attosecond pulse train generated from the combination of equally spaced continuous wave lasers and the wavelength conversion. We observed light induced modulation of the tunneling current, but it was independent of the mutual phases of the continuous lasers. The results suggests that the origin of the modulation is due to the intensity of the excitation laser and is not driven by the electric field of light. On thi other hand, we also investigated photoexcited STM and ultrafast pump-probe spectroscopy that could give us important information for realizing the nanoscale ultrafast spectroscopy.
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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 |
本研究の成果は、ナノスケールの超高速分光法の新たな可能性を明らかにしたことにある。残念ながら、アト秒パルスとSTMの組み合わせによる、光電場を通したトンネル電流の誘起を観測することはできなかったが、派生して光励起とSTMとの組み合わせが、熱のダイナミクスや、原子層物質など興味深い物質のフォノンダイナミクスの研究においても有用となる可能性が明らかになった。今後、これらのダイナミクスを解明することで、物質の光励起に関する知見を得ることができるものと考えられる。
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