Stuttgart 2012 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster: Atomic systems in external fields

A 26.9: Poster

Mittwoch, 14. März 2012, 16:30–19:00, Poster.V

Quantum Breathing Mode of Interacting Particles in a Harmonic Trap — •Jan Willem Abraham, David Hochstuhl, Karsten Balzer, and Michael Bonitz — Institut für theoretische Physik und Astrophysik, CAU 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 behaviour 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 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, we deepen the understanding of the BM during the transition from the ideal quantum to the strongly coupled classical regime, where the breathing frequency depends on the pair interaction strength. We present time-dependent Hartree-Fock simulations for 2 to 20 fermions with Coulomb interaction which yield the dependency of the quantum BM on the particle number.