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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Abstract

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

DOI:https://doi.org/10.1103/PhysRevLett.111.175302

© 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

  • *gerhard.zuern@physi.uni-heidelberg.de

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Issue

Vol. 111, Iss. 17 — 25 October 2013

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Heating up of Superconductors
January 27, 2017

This collection marks the 30th anniversary of the discovery of high-temperature superconductors. The papers selected highlight some of the advances that have been made to date, both in understanding why these compounds behave in the way they do, and in utilizing them in applications. The papers included in the collection have been made free to read.

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