Exploring field-induced remnant magnetization traps for Rb atoms

Atomchips serve as versatile quantum optics devices to manipulate ultracold atoms. Having a superconducting atomchip not only provides us with a long coherence time for future hybrid quantum systems, but also gives the opportunity to investigate properties of superconducting materials. In this work, the niobium Z-structure of the atomchip is magnetized by an external magnetic field. The remnant magnetization owing to the hysteresis behavior of the type-II superconducting structure is then used to trap the atoms without applying a chip current and the influence of this magnetization on the trapping the atoms is probed. More characteristics of the field-induced remnant magnetization trap are investigated, like trap-stability and the distance of the atom cloud to the trapping wire for different bias fields.