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Formation and dynamics of anti-ferromagnetic correlations in tunable optical lattices
Daniel Greif, Gregor Jotzu, Michael Messer +2
We report on the observation of anti-ferromagnetic correlations of ultracold fermions in a variety of optical lattice geometries that are well described by the Hubbard model, inclu…
Creating State-Dependent Lattices for Ultracold Fermions by Magnetic Gradient Modulation
Gregor Jotzu, Michael Messer, Frederik Görg +3
We demonstrate a versatile method to create state-dependent optical lattices by applying a magnetic field gradient modulated in time. This allows for tuning the relative amplitude…
Exploring competing density order in the ionic Hubbard model with ultracold fermions
Michael Messer, Rémi Desbuquois, Thomas Uehlinger +4
We realize and study the ionic Hubbard model using an interacting two-component gas of fermionic atoms loaded into an optical lattice. The bipartite lattice has honeycomb geometry…