Hannover 2010 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 38: Quantum Gases: Bosons III / Lattices I

Q 38.2: Talk

Wednesday, March 10, 2010, 16:45–17:00, E 001

Interaction of a BEC with a surface: towards a many-body cavity QED — •Jürgen Schiefele and Carsten Henkel — Universität Potsdam, Institut für Physik und Astronomie

We consider the collective Casimir-Polder interaction between a trapped gas of condensed Bosons and a plane surface through the coupling of the condensate atoms with the electromagnetic field. Technically, we aim at a systematic perturbation theory describing the electromagnetic self-energy of a trapped Bose gas near a surface. In the leading order, the interaction energy is---as expected---proportional to the number of atoms in the condensate mode, but atom-atom interactions lead to corrections compared to the single-atom theory. The interaction energy in the next order is proportional to the number of pairs in the condensate mode.