Dresden 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
CPP: Fachverband Chemische Physik und Polymerphysik
CPP 14: POSTERS Nanoparticles
CPP 14.12: Poster
Dienstag, 24. März 2009, 14:00–16:30, P3
Absorption and energy transfer of quantum 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 quantum aggregates (e.g. optical properties and energy transfer dynamics). We treat this exciton-phonon coupling using a non-Markovian stochastic Schrödinger equation [1]. 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 [2]) and the exact solution for the extreme case when the complex spectral density is replaced by that of a single harmonic oscillator.
[1] T. Yu, L. Diosi, N. Gisin, W. Strunz, Phys. Rev. A. 60, (1999) 91
[2] J.S. Briggs, A. Herzenberg J. Phys. B 3, 1663 (1970)