Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 52: Quantum gases: Fermions

Q 52.5: Vortrag

Donnerstag, 21. März 2013, 15:15–15:30, F 342

Quenching into the quantum AF]{Quenching into the quantum antiferromagnetic phase of ultra-cold fermions — Monika Ojekhile, •Robert Höppner, Ludwig Mathey, and Henning Moritz — University of Hamburg

The quantum antiferromagnetic phase of the two-dimensional Heisenberg model is one of the quintessential phases of many-body physics. To create and study this phase experimentally in ultra-cold fermionic atoms is one of the main challenges in the field of ultra-cold atoms. One important obstacle in these experiments are the high-entropy edge regions in the atomic trap, which can lead to substantial heating of the sample when the system is manipulated in a slow, adiabatic manner to create the phase. Here, we study if and how this phase can be created by a fast quench instead. We consider several realistic quenches of the lattice parameters and external fields, as well as several initial states, as ingredients of the quench. We estimate the amount of excitations created in the quench using spin wave theory, and thereby determine what the optimal strategy is to reach the quantum antiferromagnetic phase.