Mainz 2017 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 54: Ultracold atoms and BEC - V (with A)
Q 54.6: Talk
Friday, March 10, 2017, 12:15–12:30, N 1
Sudden and Slow Quenches into the Antiferromagnetic Phase of Ultracold Fermions — Monika Ojekhile1, •Robert Höppner1, Henning Moritz2, and Ludwig Mathey1 — 1Zentrum 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