Mainz 2017 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 15: Ultracold atoms and BEC - II (with A)

Q 15.8: Talk

Monday, March 6, 2017, 18:45–19:00, N 1

Quantum Simulation of Mesoscopic Fermi Systems — •Philipp Preiss, Andrea Bergschneider, Vincent Klinkhamer, Jan-Hendrik Becher, Gerhard Zürn, and Selim Jochim — Universität Heidelberg, 69120 Heidelberg, Germany

Ultracold quantum gases in optical potentials have achieved spectacular progress in the experimental simulation of complex quantum systems. Complementary to many-body experiments, mesoscopic systems comprised of a small number of atoms offer the possibility to study highly entangled quantum states with an exceptional degree of versatility and control.

We are implementing a highly tunable platform to study such correlated few-fermion systems. As already demonstrated in our group, quantum states of 6Li atoms can be prepared with a deterministic atom number and spin configuration, and interactions are tunable via a magnetic Feshbach resonance. We are extending these techniques to a large range of trap geometries, including trap arrays as well as low-dimensional and toroidal systems. A novel readout scheme with single-particle and spin sensitivity allows us to measure spin- and momentum correlations.

The tunable few-fermion system will enable the realization of many novel mesoscopic systems, for example cylindrical optical lattices with unusual periodic boundary conditions. In two-dimensional traps, we will be able to study the formation of shell structure as well as the emergence of fermion pairing in the presence of interactions. I will discuss the status and prospects of our mesoscopic quantum simulator.