# ultracold

## A Setup for Creating Arbitrary Potentials in a Two-dimensional 39K BEC with a Digital Micromirror Device

This thesis presents a setup capable of creating arbitrary potentials for a two-dimensional Bose-Einstein condensate. A Digital Micromirror Device is used to spatially modulate and thus shape a laser beam. Reimaged to the position of the atomic …

## Universal scaling dynamics at non-thermal fixed points in multi-component Bose gases far from equilibrium

Far from equilibrium, comparatively little is known about the possibilities nature reserves for the structure and states of quantum many-body systems. A potential scenario is that these systems can approach a non-thermal fixed point and show …

## 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 …

## Multipartite Entanglement from Quench Dynamics in Spinor Bose Gases using Bogoliubov Theory

Studying the entanglement among many particles is a central topic of current research in quantum many-body systems and has great importance to the field of quantum metrology. In this context, the quantum Fisher information (QFI) provides a powerful …

## Elastic Scattering Time of Matter Waves in Disordered Potentials

We report on the direct measurement of the elastic scattering time $\tau_S$ of ultracold atoms propagating in optical disordered potentials. By exploring this fundamental quantity over a large range of experimental parameters, we observe variations …

## 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 …

## Far-From-Equilibrium Quantum Many-Body Systems

This thesis examines, along side a series of experiments, the far-from-equilibrium dynamics of isolated quantum many-body systems. As a model example we study the relaxation of a single and two linearly coupled one-dimensional Bose gases, brought …

## Coherent optical nano-tweezers for ultra-cold atoms

There has been a recent surge of interest and progress in creating subwavelength free-space optical potentials for ultracold atoms. A key open question is whether geometric potentials, which are repulsive and ubiquitous in the creation of …