Conical intersections induced by quantum light: field-dressed spectra from the weak to the ultrastrong coupling regimes

In classical laser fields with frequencies resonant with the electronic excitation in molecules, it is by now known that conical intersections are induced by the field and are called light-induced conical intersections (LICIs). As optical cavities have become accessible, the question arises whether...

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Main Authors: Szidarovszky, Tamás (Author) , Cederbaum, Lorenz S. (Author)
Format: Article (Journal)
Language:English
Published: October 8, 2018
In: The journal of physical chemistry letters
Year: 2018, Volume: 9, Issue: 21, Pages: 6215-6223
ISSN:1948-7185
DOI:10.1021/acs.jpclett.8b02609
Online Access:Verlag, Volltext: https://doi.org/10.1021/acs.jpclett.8b02609
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Author Notes:Tamás Szidarovszky, Gábor J. Halász, Attila G. Császár, Lorenz S. Cederbaum, Ágnes Vibók

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520 |a In classical laser fields with frequencies resonant with the electronic excitation in molecules, it is by now known that conical intersections are induced by the field and are called light-induced conical intersections (LICIs). As optical cavities have become accessible, the question arises whether their quantized modes could also lead to the appearance of LICIs. A theoretical framework is formulated for the investigation of LICIs of diatomics in such quantum light. The eigenvalue spectrum of the dressed states in the cavity is studied, putting particular emphasis on the investigation of absorption spectra of the Na2 molecule, that is, on the transitions between dressed states, measured by employing a weak probe pulse. The dependence of the spectra on the light-matter coupling strength in the cavity and on the frequency of the cavity mode is studied in detail. The computations demonstrate strong nonadiabatic effects caused by the appearing LICI. 
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