Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 68: Quantum Gases: Fermions III
Q 68.6: Vortrag
Freitag, 4. März 2016, 15:45–16:00, e001
Fluctuations and correlations in the two-dimensional Hubbard Model — •Jan Henning Drewes1, Luke Miller1,2, Eugenio Cocchi1,2, Chun Fai Chan1, Daniel Pertot1, Ferdinand Brennecke1, and Michael Köhl1 — 1Physikalisches Institut, University of Bonn, Wegelerstrasse 8, 53115 Bonn, Germany — 2Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge CB3 0HE, United Kingdom
Quantum gases of interacting fermionic atoms in optical lattices promise to shed new light on the low-temperature phases of the Hubbard model such as spin-ordered phases, or in particular, on possible d-wave superconductivity. In this context it remains challenging to access the correlation functions underlying strongly-correlated many-body states. We experimentally realise the two-dimensional Hubbard model by loading a quantum degenerate Fermi gas of 40K atoms into a three-dimensional optical lattice geometry. High resolution absorption imaging in combination with radio-frequency spectroscopy is applied to spatially resolve the atomic distribution in a single layer in the vertical direction. We focus on local measurements of fluctuations of the density of singly- and doubly occupied lattice sites as well as of the local spin-imbalance. Our measurements allow for thermometry using the fluctuation-dissipation theorem and provide information about spatial spin-correlations.