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Reversible Switching of Strong Light-Matter Coupling Using Spin-Crossover Molecular Materials
Lijun Zhang1, Karl Ridier1, Oleksandr Ye Horniichuk1
1Laboratoire de Chimie de Coordination, CNRS UPR 8241, Université de Toulouse 205 route de Narbonne, F-31077 Toulouse, France.
The Journal of Physical Chemistry Letters
|July 24, 2023
Summary
Researchers achieved switchable strong light-matter coupling using spin-crossover molecules. This breakthrough enables tunable control over hybrid quantum states for advanced molecular materials and polaritonic chemistry applications.
Area of Science:
- Quantum Chemistry
- Materials Science
- Optics
Background:
- Hybrid light-matter states offer control over quantum states and molecular functionalities.
- Confined electromagnetic fields interacting with matter excitations are key to these states.
Purpose of the Study:
- To report the first observation of switchable strong light-matter coupling in bistable spin-crossover molecules.
- To demonstrate control over light-matter hybridization strength via molecular state switching.
Main Methods:
- Spectroscopic measurements.
- Transfer-matrix simulations.
- Coupled-oscillator simulations.
Main Results:
- Observation of Rabi splitting up to 550 meV, entering the ultrastrong coupling regime.
- Demonstration of thermally induced switching between low-spin and high-spin states.
- Fine control of light-matter hybridization strength, enabling switching between coupling regimes.
Conclusions:
- Spin-crossover molecules are promising active nanomaterials for tunable polaritonic devices.
- This work opens avenues for polaritonic chemistry and advanced control of molecular functionalities.
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