Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 15: Poster: Quantum Optics and Photonics I

Q 15.21: Poster

Monday, March 23, 2015, 17:00–19:00, C/Foyer

Exploring anti-ferromagnetic correlations of ultracold fermions in varying optical lattice geometries — •Gregor Jotzu, Daniel Greif, Michael Messer, Frederik Görg, Rémi Desbuquois, and Tilman Esslinger — Institute for Quantum Electronics, ETH Zurich, 8093 Zurich, Switzerland

Ultracold fermions in optical lattices are an ideal toolbox for studying open questions in quantum magnetism in various lattice geometries, ranging from simple cubic to honeycomb and spin ladder configurations. While not only allowing for a highly controlled approach to the thermodynamic properties, the cold atoms approach can also give insight into the dynamic properties of the system and even the response to smooth changes of the underlying lattice geometry.

We load a fermionic quantum gas of K-40 prepared in a balanced, two-component spin mixture into a tunable-geometry optical lattice. We observe the formation of anti-ferromagnetic spin correlations in various geometries, including simple cubic, square, honeycomb and spin-ladder configurations. Our findings demonstrate that quantum magnetism can be realized and studied with ultracold atoms in a broad variety of lattice geometries. Additionally, we demonstrate first experimental results on the dynamics of spin correlations.