Berlin 2008 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
TT: Fachverband Tiefe Temperaturen
TT 7: Matter at Low Temperature: Poster Session
TT 7.22: Poster
Montag, 25. Februar 2008, 14:00–18:00, Poster B
Collective quantum modes of parabolically confined mesoscopic Fermi systems — •Karsten Balzer, Christian Henning, and Michael Bonitz — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität Kiel, Leibnizstrasse 15, 24098 Kiel, Germany
For interacting few particle systems, the internal dynamics in terms of normal modes is of broad interest in many fields of research—e.g. in complex plasmas, (dilute) quantum Fermi gases/liquids or BEC-BCS systems, the normal mode spectrum is directly linked to interesting system properties and to the response to external electromagnetic fields.
Here, we go beyond linear response theory and study collective modes in the quantum regime by applying Nonequilibrium Green’s function (NEGF) techniques at zero and finite temperatures [1,2]. In particular, we investigate the quantum breathing mode for fermionic 1D and 2D systems (being confined in harmonic traps) interacting via a 1/rα pair-potential [3]. The dependence of the breathing frequency and the time-dependent density on the relative interaction strength is discussed for a wide range of parameters including nonlinear effects [4].
[1] M. Bonitz, K. Balzer, and R. van Leeuwen, Phys. Rev. B 76, 045341 (2007).
[2] ”Nonequilibrium Green’s function approach to artificial atoms”, K. Balzer, Diploma thesis, Kiel University (2007).
[3] see poster ”NEGF approach to correlated trapped fermions”, K. Balzer, M. Bonitz, N.E. Dahlen, and R. van Leeuwen.
[4] B. Partoens, F.M. Peeters, J. Phys.: Cond. Mat. 9, No. 25 (1997).