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Q: Fachverband Quantenoptik und Photonik

Q 22: Quantengase: Fermionen im Gitter

Q 22.2: Vortrag

Dienstag, 3. März 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.