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Q: Fachverband Quantenoptik und Photonik
Q 56: Poster III
Q 56.36: Poster
Thursday, March 21, 2013, 16:00–18:30, Empore Lichthof
Superexchange dynamics of ultracold high-spin fermions — •Ole Jürgensen, Dirk-Sören Lühmann, and Klaus Sengstock — Institut für Laserphysik, Universität Hamburg
Superexchange interactions are of fundamental relevance for quantum magnetism and are believed to play an important role in high-Tc superconductivity.
We theoretically study the dynamics of high-spin fermions loaded in a one-dimensional optical lattice. In shallow lattices, spin-changing collisions allow for the melting of an initially prepared two-component band-insulator. The exact time evolution shows that particle-number fluctuations are strongly suppressed in shallow lattices and the dynamics is goverened by spin-exchange processes.
This unique system therefore allows for the direct study of superexchange interactions with high amplitudes in the abscence of direct tunneling processes.