Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 16: Atomic Clusters II

A 16.2: Fachvortrag

Mittwoch, 4. März 2009, 14:30–15:00, VMP 6 HS-B

Vibronic coupling and energy transfer on aggregates — •Alexander Eisfeld — MPI-PKS Dresden, Finite Systems

Self-organised J-aggregates of dye molecules, known for over 60 years, are emerging as remarkably versatile quantum systems with applications in photography, opto-electronics, solar cells, photo-biology and as supra-molecular fibres [1].

The optical properties and the energy transfer dynamics of such molecular aggregates are strongly affected by internal vibrations of the constituting monomers, which couple to the electronic excitation. Detailed features of the aggregate spectra could be explained using the "coherent exciton scattering" approximation [2].

A new approach based on a non-Markovian Schrödinger equation [3] allows to investigate the influence of a continuous structured phonon bath on the energy transfer and to treat uniformly the transition from coherent to incoherent motion.

[1] T. Kobayashi,(ed.) J-Aggregates, World Scientific, 1996

[2] A. Eisfeld, J. S. Briggs, Chem. Phys. 324, (2006) 376

[3] T. Yu, L. Diosi, N. Gisin, W. Strunz, Phys. Rev. A. 60, (1999) 91