Berlin 2018 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 95: Cold Atomic Gases, Superfluids, Quantum Fluids and Solids

TT 95.5: Vortrag

Donnerstag, 15. März 2018, 16:00–16:15, HFT-FT 131

Noise correlations in the attractive Hubbard model — •Stephan Humeniuk — Institute for Theoretical Physics III, University of Stuttgart

In cold atom experiments, noise correlations, which can be obtained through the analysis of time of flight images, are an important probe of the quantum state inside the trap. Determinantal quantum Monte Carlo simulations of noise correlations are presented at low and experimentally relevant, high temperatures for the attractive Hubbard model, which was recently realized in optical lattices. At half filling, the Hubbard model possesses an enlarged symmetry which leads to the degeneracy of a charge density wave and superconductivity in the ground state, and both orders show characteristic peaks in the noise correlation signal. The presence of Cooper pairs with non-zero centre of mass momentum for large Hubbard attraction (in the BEC regime of strongly bound molecules) and the detectability of η-pairing are discussed.