2021 Fiscal Year Final Research Report
Theoretical study of nonlinear optical responses of ultracold atomic systems: towards a high-resolution coherent multidimensional spectroscopy investigation of quantum many-body effects
| Project/Area Number |
19K14638
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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 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
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| Research Institution | Kyoto University (2020-2021)
Institute for Molecular Science (2019) |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2022-03-31
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| Keywords | コヒーレント2次元分光 / 量子多体系の相互作用 / 非線形光学応答 / 物質と光の相互作用 / 光共振器 / 強結合 / 化学反応の制御 / super-reaction |
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| Outline of Final Research Achievements |
Interactions between particles play a crucial role in various physical properties of quantum many-body systems. On the other hand, recent advances in laser-pulse technique have enabled the manipulations and measurements of these properties on ultrafast timescales. In this project, we have developed a new method for the direct and ultrafast probe of quantum many-body interactions through the coherent two-dimensional (2D) spectroscopy. We found that the interparticle interaction manifests itself as the emergence of off-diagonal peaks in the 2D spectrum before all the peaks coalesce into a single diagonal peak as the system approaches the strongly interacting limit.
Moreover, in relation to the nonlinear optical response of matter, we have studied the strong coupling of molecular systems to an optical cavity. We have investigated the control of chemical reactivity by the strong light-matter interaction, and discovered the super-reaction with a collective enhancement of reaction rate.
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| Free Research Field |
物性物理、化学物理
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| Academic Significance and Societal Importance of the Research Achievements |
この研究では、コヒーレント2次元分光を通して量子多体系の相互作用が直接的かつ超高速で調べられる新しい方法を開発した。これを用いて超高速で起こる量子多体効果や現象を詳細に調べることができるようになった。さらに、物質の非線形光学応答に関連して、分子と光共振器の強結合も調べられた。光と物質の強いカップリングを利用することで、分子系で起こる化学反応の制御や反応速度の集合的な上昇を伴うsuper-reactionを実現することは可能であると示された。これで、強結合で形成された分子と光のハイブリッドシステムは、分子の物理的および化学的性質が制御できる有望なプラットフォームであることは明らかになった。
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