Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 40: Quantengase (Spinor-Gase)

Q 40.3: Talk

Wednesday, March 21, 2007, 14:30–14:45, 6J

Exploring the correspondence principle with spinor condensates — •Carsten Weiß, Reinhold Walser, Wolfgang P. Schleich, and Lev Plimak — Institut für Quantenphysik, Universität Ulm, Ulm, Deutschland

Studying many-body quantum physics requires a priori insight into the nature of the quantum state. In the context of three-dimensional condensed bosonic gases, the Gross-Pitaevskii mean-field approximation proved to be very successful in the last decade. However current experiments progress towards lower dimensional and strongly correlated systems [1].

In this contribution we will discuss a basic approach to study the nature of the quantum state in Fock space. By studying a spinor condensate [2-4] in a few mode Born-Oppenheimer approximation we can describe the semi-classical as well as full quantum mechanical dynamics of the system. We find distinctively different behavior for the collective response, which can be either continuous Bogoliubov excitations or discrete Bloch oscillations in Fock space.

[1] B. Paredes et al., Nature 429, 277 (2004)

[2] W. Zhang et al., Phys Rev. A, 72, 013602 (2005).

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

[4] L. Plimak et al., Opt. Comm. 264, 311 (2006).