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Doublon-hole correlations and fluctuation thermometry in a Fermi-Hubbard gas

We report on the single atom and single site-resolved detection of the total density in a cold atom realization of the 2D Fermi-Hubbard model. Fluorescence imaging of doublons is achieved by splitting each lattice site into a double well, thereby separating atom pairs. Full density readout yields a direct measurement of the equation of state, including direct thermometry via the fluctuation-dissipation theorem. Site-resolved density correlations reveal the Pauli hole at low filling, and strong doublon-hole correlations near half filling. These are shown to account for the difference between local and non-local density fluctuations in the Mott insulator. Our technique enables the study of atom-resolved charge transport in the Fermi-Hubbard model, the site-resolved observation of molecules, and the creation of bilayer Fermi-Hubbard systems.

preprint2020arXivOpen access
Thomas HartkeBotond OregNingyuan JiaMartin Zwierlein
cond-mat.str-elcond-mat.quant-gas
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Thomas HartkeBotond OregNingyuan JiaMartin Zwierlein

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