Radiative pumping vs vibrational relaxation of molecular polaritons: a bosonic mapping approach.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 40175373.
- Also identified by DOI 10.1038/s41467-025-58045-5 and PMC identifier 11965570.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
We present a formalism to study molecular polaritons based on the bosonization of molecular vibronic states. This formalism accommodates an arbitrary number of molecules N, excitations and internal vibronic structures, making it ideal for investigating molecular polariton processes accounting for finite N effects. We employ this formalism to rigorously derive radiative pumping and vibrational relaxation rates. We show that radiative pumping is the emission from incoherent excitons and divide its rate into transmitted and re-absorbed components. On the other hand, the vibrational relaxation rate in the weak linear vibronic coupling regime is composed of a <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>O</mi> <mrow><mo>(</mo> <mrow><mn>1</mn> <mo>/</mo> <mi>N</mi></mrow> <mo>)</mo></mrow> </math> contribution already accounted for by radiative pumping, and a <math xmlns="http://www.w3.org/1998/Math/MathML"><mi>O</mi> <mrow><mo>(</mo> <mrow><mn>1</mn> <mo>/</mo> <msup><mrow><mi>N</mi></mrow> <mrow><mn>2</mn></mrow> </msup> </mrow> <mo>)</mo></mrow> </math> contribution from a second-order process in the single-molecule light-matter coupling that we call polariton-assisted Raman scattering. This scattering is enhanced when the difference between fluorescence and lower polariton frequencies matches a Raman-active excitation.