Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 53: Ultra fast phenomena
HL 53.3: Talk
Friday, March 30, 2007, 11:30–11:45, H15
Nonequilibrium Green's functions approach to artificial atoms: Equilibrium properties — •Karsten Balzer1, Michael Bonitz1, Nils-Erik Dahlen2, and Robert van Leuween2 — 1ITAP, Universität Kiel, Leibnizstr. 15, 24098 Kiel, Germany — 2Theoretical Chemistry, Materials Science Center, Rijksuniversiteit Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands
Quantum confined particles, such as electrons and excitons in semiconductor nanostructures [1], valence electrons in metal clusters or trapped ultra-cold atomic and molecular gases, can be seen as artificial atoms. In order to self-consistently treat confinement and correlation effects we have developed a nonequilibrium Green's functions (NEGF) approach which can be efficiently applied to these systems.
We present results for the correlated equilibrium state for the example of N charged fermions in an oscillator potential which serve as initial data for studying the response to external fields [see poster: K. Balzer et al.]. Extending previous applications for quasi-homogeneous systems [2], we here start in thermal equilibrium at finite densities, solving the Dyson equation on the imaginary branch of the Keldysh-contour. We demonstrate the advantages of using an appropriate basis representation of the NEGF. Throughout, correlation effects are taken into account in full diagrammatically second order, including exchange.
[1] P. Ludwig, A. Filinov, M. Bonitz, and H. Stolz, phys. stat. sol. (b) 243, No. 10 (2006). [2] Introduction to Computational Methods in Many-Body Physics, M. Bonitz and D. Semkat (Eds.) Rinton Press (2006).