Modulation of non-adiabatic processes via light-matter strong coupling

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01886
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 32010:Fundamental physical chemistry-related
• Research Institution: Kyoto University
• Principal Investigator: Watanabe Kazuya 京都大学, 理学研究科, 教授 (30300718)
• Co-Investigator(Kenkyū-buntansha): 安池 智一 放送大学, 教養学部, 教授 (10419856) ; 奥山 弘 京都大学, 理学研究科, 准教授 (60312253)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 局在プラズモン / plexciton / 輻射場ー物質強結合 / 表面分光

Outline of Final Research Achievements

Plexciton formation between the localized surface plasmon (LSP) of silver clusters and electronic transitions of fullerenes is experimentally observed under ultrahigh vacuum conditions. We have studied the correlation between the plexciton eigenenergy and the molecular coverage and revealed the splitting of the LSP band into multiple peaks. Model calculations, in which the plexciton coupling is approximated by a point-dipole interaction, reveal the mixing between the Ag LSP and the fullerene internal excitations. The coupling energy exceeds 0.6 eV, indicating that the system reaches a strong coupling regime.

Free Research Field

物理化学

Academic Significance and Societal Importance of the Research Achievements

輻射場と物質の結合によるポテンシャル変調の可能性は近年着目されているが，その微視的機構については不明な点が多い．本研究では，金属ナノ粒子の局在プラズモンと吸着分子の強結合について，これまで行われてこなかった表面科学的分析手法を駆使して，特にその吸着量とplexciton状態の固有エネルギーの関係を明らかにした．この成果は今後の輻射場－物質結合による物性変調研究の発展の礎となるものである．