TY - JOUR A1 - Hartmann, Michael A1 - Schreiber, Michael A1 - Streitwolf, H.-W. A1 - Mukamel, Shaul T1 - Nonlinear optical excitations in femtosecond spectroscopy of conjugated polymers JF - Journal of Luminescence N2 - We have investigated the optical excitation of solitons and charge transfer excitons in polymer chains by solving the equations of motion for the reduced density matrix and the lattice displacement simultaneously in time. Electron-phonon coupling leads to polaron-exciton formation which can be identified in transient pump-probe signals. KW - Optical excitation KW - Femtosecond spectroscopy KW - Conjugated polymers Y1 - 1995 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0298-opus4-5795 VL - 66-67 SP - 97 EP - 101 ER - TY - CHAP A1 - Hartmann, Michael A1 - Takahashi, Akira A1 - Mukamel, Shaul A1 - Schreiber, Michael T1 - Soliton and exciton effects in femtosecond spectroscopy of conjugated polymers T2 - International Conference on Excitonic Processes in Condensed Matter N2 - We introduce a concept which allows to study the nonlinear optical response of conjugated polymers taking into account many-body effects of the excitation process. The formation of charge transfer excitons and the creation of lattice distortions are studied in short polymer chains by solving the self consistent equations of motion for the reduced single electron density matrix and the lattice displacement. The coupling of electronic motions to lattice dynamics gives rise to the formation of excitonic polarons, which can be identified in the femtosecond pump-probe signal. KW - Engineering KW - Polymers KW - Spectroscopy Y1 - 1995 N1 - Volltext aus urheberrechtlichen Gründen nicht verfügbar. Fulltext due to copyright not available. ER - TY - JOUR A1 - Hartmann, Michael A1 - Chernyak, Vladimir Y. A1 - Mukamel, Shaul T1 - Real-space coupled-oscillator approach to the radiative decay of conjugated polymers JF - Physical Review B N2 - The optical response of conjugated polymers is calculated using a one-dimensional tight-binding model with Coulomb interactions, and adopting the multipolar form for the electromagnetic field Hamiltonian. By formulating the problem using the reduced single-electron density matrix and its evolution in Liouville space, we obtain a real-space description for the elementary electronic excitations. A unified expression for the linear response including radiative decay, which is valid for arbitrary chain size compared with the optical wavelength, is described. For small sizes it shows exciton confinement effects on the radiative decay and for larger sizes it fully incorporates polariton effects. KW - Conjugated polymers Y1 - 1995 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:0298-opus4-5813 VL - 52 IS - 4 SP - Keine Angabe - No details EP - Keine Angabe - No details ER -