Dresden 2017 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 64: Coherent Quantum Dynamics (joint session DY, TT, organized by DY)
TT 64.10: Talk
Thursday, March 23, 2017, 12:15–12:30, ZEU 160
Probing density and spin correlations in two-dimensional Hubbard model with ultracold fermions — •Chun Fai Chan1, Jan Henning Drewes1, Marcell Gall1, Nicola Wurz1, Eugenio Cocchi1,2, Luke Miller1,2, 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 is a promising candidate to study strongly correlated quantum phases of the Hubbard model such as the Mott-insulator, spin-ordered phases, or in particular d-wave superconductivity. 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 radiofrequency spectroscopy is applied to spatially resolve the atomic distribution in a single 2D layer. We investigate in local measurements of spatial correlations in both the density and spin sector as a function of filling, temperature and interaction strength. In the density sector, we compare the local density fluctuations and the global thermodynamic quantities, and in the spin sector, we observe the onset of non-local spin correlation, signalling the emergence of the anti-ferromagnetic phase.