Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 14: Quantengase: Bosonen 2

Q 14.9: Talk

Monday, March 12, 2012, 18:30–18:45, V47.02

Dynamics of interacting bosons with tunable exchange symmetry — •Malte C. Tichy, Ole S. Sørensen, Søren Gammelmark, Jacob F. Sherson, and Klaus Mølmer — Lundbeck Foundation Theoretical Center for Quantum System Research, Department of Physics and Astronomy, University of Aarhus, DK-8000 Aarhus, Denmark

Quantum many-body dynamics, such as they are observed in experiments with ultracold atoms, rely on the interparticle interaction as well as on exchange effects induced by the bosonic or fermionic nature of the particles. We present a framework that allows to deliberately tune the strength of both effects in order to achieve a differentiated understanding of the dynamics. For this purpose, the particles are given an additional degree of freedom, which can be realized by coherently populating different hyperfine levels. Within this setting, we study the double-well dynamics of bosons with varying degree of distinguishability. The full counting statistics are extracted via a numerically exact quantum treatment based on the Bose-Hubbard Hamiltonian, which is complemented by a semiclassical description that is rooted in the discrete Gross-Pitaevskii equation. The exchange interaction turns out to be an indispensable ingredient that strongly boosts Josephson-type oscillations.