Article (Scientific journals)
Funneling dynamics in a phenylacetylene trimer: Coherent excitation of donor excitonic states and their superposition
Breuil, Gabriel; Mangaud, Etienne; Lasorne, Benjamin et al.
2021In Journal of Chemical Physics, 155, p. 034303
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Keywords :
Phenylacetylene trimer; open quantum system HEOM; coherent excitation
Abstract :
[en] Funneling dynamics in conjugated dendrimers has raised great interest in the context of artificial light-harvesting processes. Photoinduced relaxation has been explored by time-resolved spectroscopy and simulations, mainly by semiclassical approaches or referring to open quantum systems methods, within the Redfield approximation. Here, we take the benefit of an ab initio investigation of a phenylacetylene trimer, and in the spirit of a divide-and-conquer approach, we focus on the early dynamics of the hierarchy of interactions. We build a simplified but realistic model by retaining only bright electronic states and selecting the vibrational domain expected to play the dominant role for timescales shorter than 500 fs. We specifically analyze the role of the in-plane high-frequency skeletal vibrational modes involving the triple bonds. Open quantum system non-adiabatic dynamics involving conical intersections is conducted by separating the electronic subsystem from the high-frequency tuning and coupling vibrational baths. This partition is implemented within a robust non-perturbative and non- Markovian method, here the hierarchical equations of motion. We will more precisely analyze the coherent preparation of donor states or of their superposition by short laser pulses with different polarizations. In particular, we extend the π-pulse strategy for the creation of a superposition to a V-type system. We study the relaxation induced by the high-frequency vibrational collective modes and the transitory dissymmetry, which results from the creation of a superposition of electronic donor states.
Disciplines :
Chemistry
Author, co-author :
Breuil, Gabriel;  univ Montpellier
Mangaud, Etienne;  Univ Gustave Eiffel Marne-La-Vallée
Lasorne, Benjamin;  univ Montpellier
Atabek, Osman;  Université Paris-Saclay
Desouter-Lecomte, Michèle ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Language :
English
Title :
Funneling dynamics in a phenylacetylene trimer: Coherent excitation of donor excitonic states and their superposition
Publication date :
July 2021
Journal title :
Journal of Chemical Physics
ISSN :
0021-9606
eISSN :
1089-7690
Publisher :
American Institute of Physics, United States - New York
Volume :
155
Pages :
034303
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 16 July 2021

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