Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 7: Quantengase: Fermionen

Q 7.2: Vortrag

Montag, 12. März 2012, 14:15–14:30, V47.02

Pairing in a few-fermion system with attractive interactions — •Thomas Lompe1,2, Gerhard Zürn1,2, Friedhelm Serwane1,2, Andre Wenz1,2, Vincent Klinkhammer1,2, and Selim Jochim1,21Physikalisches Institut, Universität Heidelberg — 2MPI für Kernphysik, Heidelberg

Recently, our group has demonstrated the ability to prepare small samples of neutral fermionic atoms confined in an optical microtrap [1,2]. We can control the particle number and the motional quantum state of the particles with near unity fidelity. Here we report on our studies of systems consisting of atoms in two spin states with attractive interparticle interactions. We probe the system by deforming the trapping potential and observing the tunneling of particles out of the trap. We observe several signatures of pairing such as an increase of the tunneling time constants for stronger interactions and the appearance of pair correlations in the tunneling. With our tunneling measurements we also observe strong differences between systems with odd and even particle numbers. This is similar to the odd-even effect observed for the binding energies of nuclei.

[1] F. Serwane et al., Science 332, 336-338 (2011)

[2] G. Zürn et al., arXiv:1111.2727 (2011)

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