Berlin 2001 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 16: Poster: Dynamics of Molecular Systems, Polymer Dynamics, Glass Transition, Crystallization, Electronic Properties of Polymers

CPP 16.1: Poster

Montag, 2. April 2001, 12:30–15:00, AT1

Semiclassical path integral approach to dissipative quantum dynamics: coherent state representation — •A. Novikov, U. Kleinekathöfer, and M. Schreiber — Institut für Physik, Technische Universität, D-09107 Chemnitz, Germany

Employing the path integral technique the quantum dynamics of systems with dissipation is investigated. The dissipation in the system is described as a consequence of its coupling to a thermal bath consisting of an infinite number of harmonic oscillators. Here we use the coherent state representation to calculate the path integrals. The well-known Herman-Kluk method is usually used together with a phase space representation. In contrast to this the present alternative treatment for the calculation of path integrals in coherent state representation can be used for system Hamiltonians which are given in eigenstate representation. The system-bath coupling is assumed to be bilinear. Using the stationary phase approximation we obtained the expressions for the matrix elements of reduced density operator in the semiclassical limit. The developed method is used for studies of the damped harmonic oscillator and electron transfer reactions.