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Quantum gases of interacting fermionic atoms in optical lattices promise to shed new light on the low-temperature phases of Hubbard-type models, such as Mott-insulating and spin-ordered phases or possible d-wave superconductivity. We experimentally realize the two-dimensional Hubbard model by loading a quantum degenerate two-component Fermi gas of 40K atoms into an anisotropic optical lattice geometry. Using high-resolution absorption imaging combined with radio-frequency spectroscopy we are able to resolve the in-situ distribution of singly and doubly occupied lattice sites within a single two-dimensional layer. In this talk, I will report on the in-situ observation of the fermionic Mott insulator and a measurement of the equation of state of the repulsive Hubbard model in two dimensions which constitutes a benchmark for state-of-the-art theoretical approaches.

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Ferdinand Brennecke, University of Bonn
Seminar room 0.03, ETP
Contact: Philipp Strack