Spontaneous single-molecule dissociation in infrared nanocavities

Area of Science:

• Quantum Chemistry
• Physical Chemistry
• Chemical Physics

Background:

• Ultrastrong light-matter interaction is a novel approach for controlling chemical reactions.
• Investigating molecular vibrations within infrared cavities offers insights into chemical bond dynamics.
• Understanding these interactions is key to developing new chemical control methods.

Purpose of the Study:

• To explore the dissociation of chemical bonds in a single polar diatomic molecule within a quantized infrared electromagnetic environment.
• To investigate the role of wavepacket dynamics in bond dissociation under ultrastrong light-matter coupling.
• To develop a theoretical model predicting dissociation probabilities and identifying key parameters.

Main Methods:

• Studying the wavepacket dynamics of an individual polar diatomic molecule (hydrogen fluoride) in a quantized infrared cavity.
• Employing a multipolar formulation of quantum electrodynamics for theoretical modeling.
• Analyzing the influence of the Bloch-Seigert shift and state-dependent permanent dipole moments.

Main Results:

• Demonstrated efficient chemical bond dissociation without external thermal or coherent energy sources.
• Predicted up to 35% dissociation probability for hydrogen fluoride in under 200 fs.
• Identified a threshold coupling strength, indicated by the Bloch-Seigert shift, for spontaneous dissociation.

Conclusions:

• Ultrastrong light-matter interaction enables spontaneous molecular dissociation in specific conditions.
• The developed analytical model provides a predictive tool for controlling chemical reactivity at the quantum level.
• This research opens avenues for novel chemical reactors utilizing light-matter interactions at the single-molecule level.