Pairing in Few-Fermion Systems with Attractive Interactions

G. Zürn, A. N. Wenz, S. Murmann, A. Bergschneider, T. Lompe, and S. Jochim
Phys. Rev. Lett. 111, 175302 – Published 22 October 2013
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We study quasi-one-dimensional few-particle systems consisting of one to six ultracold fermionic atoms in two different spin states with attractive interactions. We probe the system by deforming the trapping potential and by observing the tunneling of particles out of the trap. For even particle numbers, we observe a tunneling behavior that deviates from uncorrelated single-particle tunneling indicating the existence of pair correlations in the system. From the tunneling time scales, we infer the differences in interaction energies of systems with different number of particles, which show a strong odd-even effect, similar to the one observed for neutron separation experiments in nuclei.

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  • Received 18 July 2013


© 2013 American Physical Society

Authors & Affiliations

G. Zürn1,2,*, A. N. Wenz1,2, S. Murmann1,2, A. Bergschneider1,2, T. Lompe1,2,3, and S. Jochim1,2,3

  • 1Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany
  • 2Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany
  • 3ExtreMe Matter Institute EMMI, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany

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Vol. 111, Iss. 17 — 25 October 2013

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Heating up of Superconductors
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