Bose-Einstein condensation of ⁴¹K and ⁸⁷Rb on an atom chip for sounding rocket missions

authored by

Baptist Piest

supervised by

Ernst Maria Rasel

Abstract

This thesis presents the next generation atom chip apparatus for the sounding rocket missions MAIUS-2 and -3. With the new apparatus, Bose-Einstein condensates containing 3 · 10E5 atoms of Rb-87 or 6 · 10E4 atoms of K-41 are generated within 3.4 s in ground-based operation. In addition, quantum degenerate mixtures with variable isotope ratios can be provided. An analysis of sympathetic cooling of K-41 under the influence of gravity and prospects for thermalization rates in microgravity are given. The expansion dynamics of single species Bose-Einstein condensates released from a magnetic trap is analyzed in detail. It is shown that transient magnetic fields during trap switch-off have a considerable impact on the expansion dynamics. Further, collective excitations of single and mixed ensembles are evaluated. Due to interspecies damping, collective excitations of interacting mixtures of K-41 and Rb-87 are strongly suppressed. Finally, the influence of gravity on a trapped and strongly interacting mixture is observed via rotation of the whole apparatus.

Organisation(s)

Institute of Quantum Optics
QUEST-Leibniz Research School

Type

Doctoral thesis

No. of pages

112

Publication date

2021

Publication status

Published

Electronic version(s)

https://doi.org/10.15488/11014 (Access: Open)

 

Details in the research portal "Research@Leibniz University"