Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 15: Poster I

A 15.40: Poster

Dienstag, 3. März 2009, 16:30–19:00, VMP 9 Poster

Trapped interacting bosons beyond the Gross-Pitaevskii approximation — •Martin Heimsoth, Michael Bonitz, and Alexej Filinov — Institut für Theoretische Physik und Astrophysik, Christian-Albrechts-Universität Kiel, Leibnitzstraße 15

Systems consisting of cold interacting bosons show interesting collective phenomena such as Bose-Einstein condensation or superfluidity [1,3] and are currently studied in condensed matter and atomic physics. There exist several approximation methods to such systems [2]. Here we analyse the ground-state of a two-dimensional Bose system consisting, with an approximation that was first introduced by Romanovskii [2]. We extend this Method to higher particle numbers and compare the results to quantum Monte Carlo simulations.

Furthermore, an extension to the non-equilibrium regime is developed by analysing the the dynamics of the system following short-pulse laser excitations. The excitation of collective modes, such as the breathing and center-of-mass oscillation, is of particular interest.

[1] A. Filinov, J. Boning, M. Bonitz, and Yu. Lozovik. Controlling the spatial distribution of superfluidity in radially ordered coulomb clusters. Physical Review B (Condensed Matter and Materials Physics), 77(21):214527-5, June 2008.

[2] I. A. Romanovsky. Novel properties of interacting particles in small low-dimensional systems. PhD thesis, September 2006.

[3] M. Heimsoth and M. Bonitz. Physica (2009)