Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Quantengase: Fermionen im Gitter
Q 22.2: Talk
Tuesday, March 3, 2009, 14:30–14:45, VMP 6 HS-A
Theoretical study of the anomalous expansion of increasingly attractive fermionic atoms in an optical lattice — Lucia Hackermüller1, Ulrich Schneider1, Takuya Kitagawa2, •Maria Moreno-Cardoner1, Thorsten Best1, Sebastian Will1, Simon Braun1, Eugene Demler2, Immanuel Bloch1, and Belén Paredes1 — 1Institut für Physik, Johannes Gutenberg-University, 55099 Mainz, Germany — 2Physics Department, Harvard University, Cambridge, MA02138, USA
We study theoretically and compare with the experimental result the size behaviour of an ultracold spin mixture of fermions in an optical lattice when adiabatically entering the strongly correlated regime. The size of the cloud, directly measured in the experiment using in-situ imaging, behaves as expected for weak interactions, decreasing (increasing) for an attractive (repulsive) gas. However, in the strongly interacting regime entropy is redistributed among the lattice sites in a dramatically different way leading to unexpected phenomena like an anomalous expansion of the gas on the attractive side.