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Mainz 2017 – scientific programme

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A: Fachverband Atomphysik

A 33: Ultracold atoms and BEC - V (with Q)

A 33.6: Talk

Friday, March 10, 2017, 12:15–12:30, N 1

Sudden and Slow Quenches into the Antiferromagnetic Phase of Ultracold FermionsMonika Ojekhile1, •Robert Höppner1, Henning Moritz2, and Ludwig Mathey11Zentrum für Optische Quantentechnologien and Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany — 2Institut für Laserphysik, Universität Hamburg, 22761 Hamburg, Germany

We propose a method to reach the antiferromagnetic state of two-dimensional Fermi gases trapped in optical lattices: Independent subsystems are prepared in suitable initial states and then connected by a sudden or slow quench of the tunneling between the subsystems, while subjecting the system to a time-dependent staggered magnetic field. Examples of suitable low-entropy subsystems are double wells or plaquettes, which can be experimentally realised in Mott insulating shells using optical super-lattices. Expanding on previous work reported in Ref. [1], we now investigate the effect of finite quench times and different quench protocols on the final state energy using a the quantum Heisenberg model of a finite system.

[1] Zeitschrift für Naturforschung A., Vol. 71, Issue 12, Pages 1143-1150

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