Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Quantum Gases: Fermions III
Q 68.3: Vortrag
Freitag, 4. März 2016, 15:00–15:15, e001
Direct probing of the Mott crossover in the SU(N) Fermi-Hubbard model — Christian Hofrichter1,2, Luis Riegger1,2, Francesco Scazza1,2, Moritz Höfer1,2, •Diogo Rio Fernandes1,2, Immanuel Bloch1,2, and Simon Fölling1,2 — 1Ludwig-Maximilians-Universität, Schellingstraße 4, 80799 München, Germany — 2Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany
The Fermi-Hubbard model (FHM) is a cornerstone of modern condensed matter theory. Developed for interacting electrons in solids, which typically exhibit SU(2) symmetry, it describes a wide range of phenomena, such as metal to insulator transitions and magnetic order. Its generalized SU(N)-symmetric form, originally applied to multi-orbital materials such as transition-metal oxides, has recently attracted much interest owing to the availability of ultracold atomic gases with unbroken SU(N)-symmetry. In this talk we report on a detailed experimental investigation of the SU(N)-symmetric FHM using local probing of an atomic gas of ytterbium in an optical lattice. We prepare a low-temperature SU(N)-symmetric Mott insulator and characterize the Mott crossover by directly determining the equation of state of the gas, giving model-free access to density and compressibility.