Berlin 2008 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 7: Matter at Low Temperature: Poster Session
TT 7.23: Poster
Montag, 25. Februar 2008, 14:00–18:00, Poster B
Nonequilibrium Green’s function approach to correlated trapped fermions: Equilibrium properties and nonequilibrium behavior — •Karsten Balzer1, Michael Bonitz1, and Robert van Leeuwen2 — 1Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität Kiel, Leibnizstrasse 15, 24098 Kiel, Germany — 2Department of Physics, University of Jyväskylä, 40014 Survontie 9, Jyväskylä, Finland
Using a Nonequilibrium Green’s function approach, we investigate small arrangements of parabolically confined fermions interacting via a repulsive 1/rα pair-potential in 1D and 2D. Such reduced systems are of relevance for quantum dots and wells, metal clusters or ions in traps.
The equilibrium [1] and dynamical properties [1,2] are obtained by numerically solving the Keldysh/Kadanoff-Baym equations for the two-time Green’s functions [3], where initial correlations at finite temperatures are included self-consistently starting from a correlated equilibrium Green’s function. The consideration of a wide range of relative interaction strengths allows us, in particular, to observe the transition from almost ideal Fermi liquid states to Wigner crystal behavior.
[1] ”Nonequilibrium Green’s function approach to artificial atoms”, K. Balzer, Diploma thesis, Kiel University (2007).
[2] see also poster ”Collective modes of parabolically confined mesoscopic Fermi systems”, K. Balzer, C. Henning, and M. Bonitz.
[3] ”Introduction to Computational Methods in Many Body Physics”, M. Bonitz, D. Semkat (Eds.), Rinton Press (2006).