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Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 34: Poster: Ultra-cold atoms, ions and BEC (with Q)

A 34.25: Poster

Wednesday, March 19, 2014, 16:30–18:30, Spree-Palais

Stochastic theory of thermal matter fields — •Holger Hauptmann1, Sigmund Heller1, Holger Kantz2, and Walter T. Strunz11Technische Universität Dresden — 2Max-Planck-Institut für Physik komplexer Systeme

We study quasi one-dimensional ultracold Bose gases with repulsive self interaction. A nonlinear stochastic matter-field equation of generalized Gross-Pitaevskii type will be presented to describe Bose gases in the canonical ensemble (fixed particle number). This might be a more realistic experimental scenario than the grand-canonical approach. Applications of this equation to simulate recent experiments from the Schmiedmayer group [1] will be shown, especially the emergence of correlations in quantum many-body systems. Moreover, results for equilibrium coherence properties of one-dimensional Bose gases will be presented.

[1] Langen et al. Nature Physics 9, 640-643 (2013)

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