Kiel 2011 – scientific programme

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P: Fachverband Plasmaphysik

P 18: Poster: Theorie/Simulation dichter und stark gekoppelter Plasmen

P 18.20: Poster

Wednesday, March 30, 2011, 16:30–18:30, Foyer

Quantum breathing mode of interacting particles in a harmonic trap — •Jan Willem Abraham, Karsten Balzer, Sebastian Bauch, and Michael Bonitz — ITAP, Christian-Albrechts-Universität Kiel, Leibnizstr. 15, 24098 Kiel

Time-dependent properties of interacting, harmonically confined quantum systems are of growing interest in many areas, including correlated electrons in metal clusters or quantum dots and ultracold Bose and Fermi gases in traps or optical lattices. Among these properties the behavior of the breathing mode (BM)—the [uniform] radial expansion and contraction of the system—attracts special interest as it is easily excited experimentally, and turns out [1] to give information of the system’s dimensionality, spin statistics, as well as the form and strength of the pair interaction potential.

Extending our previous work [1,2], we deepen the understanding of the BM during migration from the ideal quantum to the classical regime, in between which the breathing frequency is not independent of the pair interaction strength. Thereby, time-dependent Hartree-Fock simulations for 2 to 15 fermions with Coulomb interaction are expected to answer the question whether the quantum BM is independent of particle number [3].

[1] S. Bauch, K. Balzer, C. Henning and M. Bonitz, Phys. Rev. B 80, 054515 (2009). [2] S. Bauch, D. Hochstuhl, K. Balzer and M. Bonitz, J. Phys. Conf. Series 220, 012013 (2010). [3] J.W. Abraham, Bachelor thesis, Kiel University, 2010.