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A conic section can be defined in polar coordinates as the set of all points whose distance from a fixed point, known as the focus, bears a constant ratio to their distance from a fixed line, known as the directrix. This constant ratio is called the eccentricity. This definition unifies all types of conic sections—ellipses, parabolas, and hyperbolas—under a single framework. When the focus is positioned at the origin of the polar coordinate system, a single polar equation can...
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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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Polariton induced conical intersection and berry phase.

Marwa H Farag1, Arkajit Mandal, Pengfei Huo

  • 1Department of Chemistry, University of Rochester, 120 Trustee Road, Rochester, New York 14627, USA. pengfei.huo@rochester.edu.

Physical Chemistry Chemical Physics : PCCP
|July 30, 2021
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Summary
This summary is machine-generated.

We reveal how molecular rotations tune polariton induced conical intersections (PICIs) in optical cavities. Berry phase effects on polaritonic surfaces influence quantum dynamics and photo-fragmentation.

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Area of Science:

  • Quantum Optics
  • Molecular Spectroscopy
  • Physical Chemistry

Background:

  • Quantum light-matter interactions are crucial for understanding molecular dynamics.
  • Optical cavities enable strong coupling between photons and molecules.
  • Berry phase effects are fundamental in quantum mechanics, influencing system evolution.

Purpose of the Study:

  • Investigate the formation and effects of polariton induced conical intersections (PICIs).
  • Explore the role of molecular rotations in tuning PICIs.
  • Analyze the impact of Berry phase on polaritonic quantum dynamics and photo-fragmentation.

Main Methods:

  • Utilized the Pauli-Fierz Hamiltonian for quantum light-matter interactions.
  • Employed exact quantum propagation for polariton dynamics.
  • Developed models to isolate and study Berry phase effects.

Main Results:

  • Demonstrated that molecular rotations act as a tuning mode for PICIs in diatomic molecules.
  • Observed a π phase-shift in the lower polaritonic surface due to Berry phase.
  • Found significant influence of geometric phase on couplings and population dynamics in the upper polaritonic surface.

Conclusions:

  • Polariton induced conical intersections offer new pathways to control photochemical reactivity.
  • Berry phase effects are critical for understanding quantum dynamics in coupled light-matter systems.
  • The study provides insights into modulating molecular behavior using optical cavities.