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Q: Fachverband Quantenoptik und Photonik

Q 12: Ultra-cold atoms, ions and BEC (with A)

Q 12.33: Poster

Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof

Dissipative preparation of antiferromagnetic order in the Fermi-Hubbard model — Jan Kaczmarczyk¹, Hendrik Weimer², and •Mikhail Lemeshko¹ — ¹IST Austria, Klosterneuburg, Austria — ²Leibniz Universität Hannover, Germany

The realization of strongly correlated quantum phases such as the antiferromagnetic phase is one of the longstanding goals of quantum simulations with ultracold fermions in optical lattices. We show that a combination of two Raman-assisted hopping schemes gives rise to dissipative dynamics that exhibits a large amount of antiferromagnetic order in the steady state. We analyze the interplay between the familiar Fermi-Hubbard Hamiltonian and these additional dissipative terms using wave-function Monte-Carlo methods and a novel variational principle for dissipative quantum many-body dynamics [1]. We observe antiferromagnetic correlations appearing within experimentally accessible times on the order of 0.5 s, as well as a substantial reduction in entropy per particle compared to the current experimental setups without additional dissipation. Our considerations are based on the atomic level structure of fermionic 40K and can be implemented into existing experimental setups.

[1] H. Weimer, Phys. Rev. Lett. 114, 040402 (2015).