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Q: Fachverband Quantenoptik und Photonik

Q 53: Quantum Gases: Fermions I

Q 53.5: Vortrag

Donnerstag, 3. März 2016, 15:30–15:45, e001

Formation and dynamics of anti-ferromagnetic correlations in tunable optical lattices — •Michael Messer¹, Daniel Greif^1,2, Gregor Jotzu¹, Frederik Görg¹, Rémi Desbuquois¹, and Tilman Esslinger¹ — ¹Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland — ²Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA

Ultracold fermions in optical lattices are an ideal toolbox for studying quantum magnetism in the Hubbard model. In this model many questions on the low-temperature phase diagram still remain open, both for simple cubic and square configurations, as well as for more complex lattice geometries. Besides a highly controlled approach to studying the thermodynamic properties cold atoms can also give insight into the dynamic properties of the system in the low entropy regime.

In our experiment we load a two-component, repulsively interacting fermionic quantum gas of K-40 into a tunable-geometry optical lattice. We observe anti-ferromagnetic spin correlations on neighboring sites in both isotropic 3D cubic and more complex lattice geometries for very low temperatures. In addition we study the strength of the spin correlations in a crossover between distinct geometries. Furthermore, we investigate the formation and redistribution time of spin correlations by dynamically changing the lattice geometry.