Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 11: Nanostructures at Surfaces I

O 11.6: Vortrag

Montag, 31. März 2014, 11:45–12:00, WIL C107

Tunable superradiance in porphyrin chains on insulating surfaces — •Sebastiaan Vlaming and Alexander Eisfeld — Max Planck Institute for Physics of Complex Systems, Dresden, Germany

Recent experiments have shown that it is possible to synthesize collections of effective one-dimensional chains of non-covalently bound porphyrins on various surfaces.[1,2] We provide a study of the optical absorption properties of these systems, and we show that generally one expects the appearance of multiple superradiant transitions which can be both redshifted or blueshifted with respect to the monomer transitions. In addition, porphyrin chains can simultaneously support both redshifted and blueshifted features in the absorption spectrum. The energies, oscillator strengths and polarizations of the excitonic transitions can be understood in terms of Davydov splitting of chains with one transition per molecule. A distribution over chain lengths is proposed as a mechanism for the broadening of the superradiant transitions.

[1] S. Maier et al., Small 4, 115 (2008); Th. Glatzel et al., Isr. J. Chem. 48, 107 (2008). [2] C. Tröppner et al., Phys. Rev. B 86, 235407 (2012).