# sodium

## NaLi machine

Atomic mixture of sodium and lithium

## SoPa machine

Atomic mixture of sodium and potassium

## Experimental realization of U(1) gauge invariance in ultracold atomic mixtures

This thesis reports on the experimental realization of an elementary building block for analog quantum simulation of a U(1) lattice gauge theory in a mixture of two bosonic quantum gases. Experimentally, the building block is realized by …

## Implementing an Optical Accordion Lattice for the Realization of a Quantized Otto Cycle

This thesis presents design and characterization of a versatile optical standingwave trap for lithium atoms. Using this trap, an implementation of a quantized Otto cycle with the sodium-lithium mixture experiment that cools down a cloud of sodium …

## Design and Implementation of a Versatile Imaging Objective for Imaging of Ultracold Mixtures of Sodium and Lithium

This thesis presents the design and implementation of a high resolution objective lens for imaging ultracold atomic clouds of sodium and lithium in the NaLi experiment. The lens has been developed using the ray tracing software OSLO. The design …

## Spin Dynamics and Feshbach Resonances in Ultracold Sodium-Lithium Mixtures

This thesis presents the investigation of the two-body scattering properties of cold atoms in sodium and lithium-sodium mixtures and their effects on the many body dynamics. Since both species are alkali atoms, the combined spin of both unpaired …

## Observation of the Phononic Lamb Shift in a Synthetic Vacuum

This thesis reports on the implementation of the Fröhlich Hamiltonian in an ultracold atomic mixture. To this end, impurity atoms are immersed into a macroscopic Bose-Einstein condensate (BEC). The impurities are tightly trapped in one direction by a …

## Resonant wavepackets and shock waves in an atomtronic SQUID

The fundamental dynamics of ultracold atomtronic devices are reflected in their phonon modes of excitation. We probe such a spectrum by applying a harmonically driven potential barrier to a $^23$Na Bose-Einstein condensate in a ring-shaped trap. This …