Anomalous Temperature Dependence of Exciton Spectral Diffusion in Tetracene Thin Film (CROSBI ID 281474)
Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija
Podaci o odgovornosti
Yoshida, Tatsuya ; Watanabe, Kazuya ; Petrović, Marin ; Kralj, Marko
engleski
Anomalous Temperature Dependence of Exciton Spectral Diffusion in Tetracene Thin Film
In this work, an ultrafast spectral diffusion of the lowest exciton in a tetracene ultrathin film is studied by two-dimensional electronic spectroscopy. From the analysis of the nodal line slope, the frequency- fluctuation correlation function (FFCF) of the exciton band is extracted. The FFCF contains two components with decay times of 400 and 80 fs ; while the former can be understood by a linear exciton–phonon coupling model, the latter shows an order of magnitude increase in its amplitude from 96 to 186 K that cannot be explained by the same model. A novel scheme of the energy-gap fluctuations is examined, in which an intramolecular high-frequency mode causes the spectral diffusion that is enhanced through an anharmonic coupling to low-frequency phonon modes. This finding provides a valuable input for future theoretical predictions on the ultrafast nonadiabatic dynamics of the molecular exciton.
Excitons ; Phonons ; Thin films ; Diffusion ; Temperature dependence ; Graphene ; Tetracene
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Podaci o izdanju
11 (13)
2020.
5248-5254
objavljeno
1948-7185
10.1021/acs.jpclett.0c01537