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Decoupling from a Thermal Bath via Molecular Polariton Formation
Shota Takahashi1, Kazuya Watanabe1
1Department of Chemistry, Graduate School of Science , Kyoto University , Kyoto , 606-8502 , Japan.
The Journal of Physical Chemistry Letters
|February 5, 2020
Summary
Strong light-matter interactions in optical microcavities significantly reduce electronic energy fluctuations in molecular films. This polaron decoupling effect minimizes dynamic inhomogeneity, enhancing excited state dynamics control.
Area of Science:
- Condensed matter physics
- Quantum optics
- Photochemistry
Background:
- System-bath coupling critically influences excited state dynamics in molecular systems.
- Controlling this coupling in condensed matter is challenging.
- Polaron decoupling, via strong light-matter coupling, can mitigate reorganization energy.
Purpose of the Study:
- To demonstrate the polaron decoupling effect in reducing electronic energy fluctuations.
- To investigate the impact of microcavity confinement on system-bath coupling.
- To analyze the dynamic inhomogeneity in excited molecular systems.
Main Methods:
- Fabrication of tetraphenyldibenzoperiflanthene thin films within an optical microcavity.
- Utilizing two-dimensional electronic spectroscopy (2DES).
- Analyzing the frequency-fluctuation correlation function of polariton states.
Main Results:
- Observed significant reduction in electronic energy fluctuations in the tetraphenyldibenzoperiflanthene films.
- Demonstrated near-complete vanishing of dynamic inhomogeneity within the microcavity.
- Revealed delocalization of the lower polariton state over 10^5 molecules.
Conclusions:
- Polaron decoupling effectively suppresses dynamic inhomogeneity in molecular films inside optical microcavities.
- Enhanced delocalization of polaritons significantly reduces effective coupling to bath modes.
- Strong light-matter coupling offers a pathway to control excited state dynamics.
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