Düsseldorf 2007 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
P: Fachverband Plasmaphysik
P 22: Poster
P 22.39: Poster
Donnerstag, 22. März 2007, 16:30–18:30, Poster A
Nonequilibrium Green's functions approach to artificial atoms: Nonequilibrium behavior — Karsten Balzer1, •Michael Bonitz1, Nils-Erik Dahlen2, and Robert van Leeuwen2 — 1ITAP, Christian-Albrechts-Universität Kiel, Leibnizstr. 15, 24098 Kiel, Germany — 2Theoretical Chemistry, Materials Science Center, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
Using a nonequilibrium Green's functions (NEGF) approach, we compute the temporal behavior of quantum confined particles, which is of relevance for quantum dots, metal clusters or ions in traps. In the framework of applications to e.g. strong laser fields these systems are known to show interesting nonequilibrium behavior as well as nonlinear effects.
The dynamical properties are obtained by numerically solving the Keldysh-Kadanoff-Baym equations (KKBE) for the two-time NEGF, where initial correlations [1,2] are included self-consistently starting from a correlated thermal equilibrium Green's function for a confined system of N charged fermions. This method is shown to conserve density, momentum and total energy. In addition, we use an appropriate basis representation of the NEGF, which successfully worked to examine small molecules [2]. The results include the intra- and interband response of the system to a strong time-dependent electric field.
[1] Introduction to Computational Methods in Many-Body Physics, M. Bonitz and D. Semkat, Rinton Press (2006). [2] N. E. Dahlen, R. van Leeuwen and A. Stan, J. Phys.: Conf. Ser. 35 (2006).