Erlangen 2022 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 57: Quantum Gases II

Q 57.8: Poster

Thursday, March 17, 2022, 16:30–18:30, P

Realizing a superlattice for studying topological systems with interacting fermions — •Nick Klemmer, Janek Fleper, Jens Samland, Andrea Bergschneider, and Michael Köhl — Physikalisches Institut, University of Bonn, Bonn, Germany

Quantum simulation of the Hubbard model using ultracold atoms in optical lattices has been essential for studying strongly correlated matter. Optical superlattices, mostly realized by a superposition of two trapping wavelengths, have enabled the emulation of more complex systems. For instance, on our experiment we used an out-of-plane superlattice to study magnetic correlations in a coupled-bilayer Hubbard model [1].

In our experiment, we prepare atoms in a few-layer stack of two-dimensional lattices. Currently, we are setting up an in-plane superlattice that provides us with a chain of double wells with tunable coupling strengths. For characterizing and stabilizing the superlattice phase, we have implemented a bichromatic Michelson interferometer. This will allow us to deterministically prepare atoms in the superlattice with any desired energy tilt of the double wells. Combined with the control over the scattering length we will investigate interacting topological systems and study transport properties in time-dependent superlattices.

[1] Gall, Wurz, et al., Nature 589, 40-43 (2021)