Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 64: Poster Quantengase

Q 64.17: Poster

Donnerstag, 22. März 2007, 16:30–18:30, Poster C

Theory of spinor Bose-Einstein condensates: ground state and coherent dynamics — •Frank Deuretzbacher¹, Kai Bongs², Klaus Sengstock², and Daniela Pfannkuche¹ — ¹I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstr. 9, 20355 Hamburg, Germany — ²Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany

We study the dynamics of F = 1 and F = 2 spinor Bose-Einstein condensates following the experiments of Kronjäger et al. [1]. The evolution of these systems is commonly described by a coupled set of mean-field equations. We apply the single-mode approximation and afterwards diagonalize the Hamiltonian exactly in spin space [2,3]. In this approximation the Hamilton matrix has a band structure allowing the description of condensates with large particle numbers. We compare our results with mean-field simulations.

Furthermore, we study ground state properties of few (up to 5) strongly interacting spinor bosons. In this regime the complete Hamiltonian is diagonalized exactly and many properties, such as the energy spectrum, the densities, the momentum distribution, and the correlation function show an interesting new behavior.

[1] J. Kronjäger et al., Phys. Rev. A 72, 063619 (2005).

[2] C. K. Law, H. Pu, and N. P. Bigelow, Phys. Rev. Lett. 81, 5257 (1998).

[3] L.I. Plimak, C. Weiß, R. Walser, and W. P. Schleich, Opt. Comm. 264, 311 (2006).