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DY: Fachverband Dynamik und Statistische Physik

DY 15: ISPS Intersectional Poster Session

DY 15.26: Poster

Dienstag, 15. März 2011, 18:00–20:00, P1

Absorption and energy transfer of molecular aggregates — •Gerhard Ritschel, Jan Roden, and Alexander Eisfeld — MPI-PKS Dresden

The coupling of electronic excitation to vibrational degrees of freedom strongly influences characteristic properties of molecular aggregates such as optical properties and energy transfer dynamics. We treat this complicated exciton-phonon coupling using a non-Markovian stochastic Schrödinger equation. Solving a Holstein-type model, we calculate spectra and energy transfer for a coupling to a realistic, complex phonon bath such that energy dissipation to the phonons is fully included. Our approach captures uniformly the transition from fully coherent to incoherent excitation transfer. Using this new method we are able to investigate decoherence and entanglement in mesoscopic molecular aggregates.

On the other hand, we compare experimental spectra of such molecular aggregates, that are obtained by helium nanodroplet isolation spectroscopy and resolve individual vibrational lines, with full quantum calculations. Here we are able to explain the effect of the many vibrational modes of the molecules on the aggregate absorption.