2019 Fiscal Year Final Research Report
Photo-Induced Superconductivity Studied by Soft X-Ray Laser Angle-Resolved Photoemission Spectroscopy and Terahertz Spectroscopy
| Project/Area Number |
18K13498
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 13030:Magnetism, superconductivity and strongly correlated systems-related
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| Research Institution | The University of Tokyo |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2020-03-31
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| Keywords | 光誘起相転移 / 超伝導 / 量子物質 / 超高速現象 / 非平衡状態 |
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| Outline of Final Research Achievements |
We have studied photo-induced phases in various quantum materials including high-temperature superconducting materials by using high harmonic generation time-resolved ARPES and terahertz spectroscopy.
We have successfully revealed photo-induced superconductivity in FeSe, photo-induced metallic state in Ta2NiSe5, and ultrafast unbalanced carrier distribution in a quasicrystalline twisted-bilayer graphene.
As a result, we have published 7 journals including 4 journals that I have contributed as the first author. Also, I have presented the research results at 4 international conferences including 1 invited talks and 1 poster award. At 6 Japanese conferences, I have given talks as a presenter.
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| Free Research Field |
光物性
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| Academic Significance and Societal Importance of the Research Achievements |
本研究で見出された、光励起後に表れる量子物質での新奇な相や状態は、次世代の電気光デバイスの開発においても大変重要な知見をもたらすことを見出し、特に以下の３つの研究については、プレスリリースにより発表した。
鉄系超伝導体FeSeにおける光誘起超伝導の発現は、太陽電池や電子回路に取り入れることで発熱を抑え、将来のエネルギー問題解決への糸口になることを示した。また、励起子絶縁体候補物質Ta2NiSe5における光誘起金属状態の発見は、次世代の光スイッチング素子としての可能性を提示した。さらに、準結晶二層グラフェンにおける超高速キャリア不均衡の発見は、超高速電圧素子としての可能性を提示することに成功した。
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