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MO: Fachverband Molekülphysik
MO 23: Molekülphysik Poster 2
MO 23.15: Poster
Thursday, March 5, 2009, 16:30–19:00, VMP 8 Foyer
Absorption and energy transfer of molecular aggregates — •Jan Roden1, Walter Strunz2, John Briggs3, and Alexander Eisfeld1 — 1MPIPKS Dresden — 2TU Dresden, Theoretische Quantenoptik — 3Uni Freiburg, Theoretische Quantendynamik
The coupling of electronic excitation to vibrational degrees of freedom strongly influences characteristic properties of molecular aggregates (e.g. optical properties and energy transfer dynamics) [1]. We treat this exciton-phonon coupling using a non-Markovian stochastic Schrödinger equation [2]. Solving a Holstein-type model, we determine optical and transfer properties for exciton dynamics coupled 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. As a specific example demonstrating the capability of this approach, we investigate J-band and H-band spectra and energy transfer dynamics of mesoscopic molecular aggregates. The results are compared with that of the well established CES approximation (Coherent Exciton Scattering) [3] and the exact solution for the extreme case when the complex spectral density is replaced by that of a single harmonic oscillator.
[1] A. Eisfeld, J.S. Briggs, Phys. Rev. Lett. 96, (2006) 113003; M. Bednarz, V. A. Malyshev, J. Knoester, J. Luminescence 112, (2005) 411; S. Kirstein, S. Daehne, Int. J. Photoenergy 2006, (2006) 20363.
[2] T. Yu, L. Diosi, N. Gisin, W. Strunz, Phys. Rev. A. 60, (1999) 91
[3] J.S. Briggs, A. Herzenberg, J. Phys. B 3, 1663 (1970)