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Superradiance from Two Dimensional Brick-Wall Aggregates of Dye Molecules: The Role of Size and Shape for the Temperature Dependence

MPG-Autoren
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Eisfeld,  Alexander
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Zitation

Eisfeld, A., Marquardt, C., Paulheim, A., & Sokolowski, M. (2017). Superradiance from Two Dimensional Brick-Wall Aggregates of Dye Molecules: The Role of Size and Shape for the Temperature Dependence. Physical Review Letters, 119(9): 097402. doi:10.1103/PhysRevLett.119.097402.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-002E-27E5-9
Zusammenfassung
Aggregates of interacting molecules can exhibit electronically excited states that are coherently delocalized over many molecules. This can lead to a strong enhancement of the fluorescence decay rate which is referred to as superradiance (SR). To date, the temperature dependence of SR is described by a 1/T law. Using an epitaxial dye layer and a Frenkel-exciton based model we provide both experimental and theoretical evidence that significant deviations from the 1/T behavior can occur for brick-wall-type aggregates of finite size leading even to a maximum of the SR at finite temperature. This is due to the presence of low energy excitations of weak or zero transition strength. These findings are relevant for designing light-emitting molecular materials.