Generalization of open quantum theory for strongly coupled vibronic systems and application to spectroscopies

2021 Fiscal Year Final Research Report

• Project/Area Number: 20K22520
• Research Category: Grant-in-Aid for Research Activity Start-up
• Allocation Type: Multi-year Fund
• Review Section: 0501:Physical chemistry, functional solid state chemistry, organic chemistry, polymers, organic materials, biomolecular chemistry, and related fields
• Research Institution: The University of Tokyo
• Principal Investigator: Ikeda Tatsushi 東京大学, 大学院工学系研究科(工学部), 助教 (20887278)
• Project Period (FY): 2020-09-11 – 2022-03-31
• Keywords: 量子ダイナミクス / 量子散逸系 / 非断熱遷移過程 / 量子非局在化

Outline of Final Research Achievements

In this study, we constructed a new open quantum theory that describes the behavior of systems in dissipative environments. The new theory can describe systems coupled to very strong dissipation, which conventional theories could not describe due to breakdowns of approximations and computational divergences. We showed that strongly coupled vibronic systems often contain such dissipation and that the new theory is able to calculate the quantum dynamics of such systems.

Free Research Field

物理化学

Academic Significance and Societal Importance of the Research Achievements

エキシトンやエネルギーの量子輸送問題についての振動状態の効果は実験的・理論的に興味がもたれているが、非局在な振動状態の重ね合わせは電子と振動の結合が強い領域で生じるものであり、結果としてそれらの量子状態と周囲環境も強く結合する。本研究で構築した理論によって今まで不可能であった強結合領域の振る舞いを記述することができるようになり、振動状態の量子効果の理論的予測および実験解析を促進すると考えられる。