- Ultracold strontium and rubidium
- Mixtures, quantum gases and molecules
- Award date
- 17 March 2017
- Number of pages
- Document type
- PhD thesis
- Faculty of Science (FNWI)
- Van der Waals-Zeeman Institute (WZI)
This thesis describes important steps towards the creation of ultracold RbSr ground-state molecules. These open-shell polar molecules will be employed as a platform for quantum simulation of strongly interacting systems. The strong interaction is due to the large electric dipole moment of the molecules. In addition they possess a magnetic moment, which will allow us to control the interactions by magnetic fields.
The first step toward RbSr molecules is the experimental realization of an ultracold mixture of 87Rb and 84Sr. The Rb and Sr atoms are brought to quantum degeneracy by means of sympathetic laser and evaporative cooling of Rb by Sr. The doubly degenerate gases are loaded into an optical lattice resulting in many lattice sites occupied by one Sr and one Rb atom. Such a sample is an excellent starting point for the coherent transfer of atom pairs into molecules. Before the transfer can be achieved, high-precision spectroscopic data of the RbSr molecules has to be obtained. Two isotopic combinations, 87Rb-84Sr and 87Rb-88Sr are investigated by photoassociation spectroscopy. The spectroscopic measurements show that the coherent association of atom pairs into molecules will be easier in the isotopic combination 87Rb-87Sr instead of the one used for this thesis. In addition the spectroscopic studies lead to the precise determination of the interspecies scattering length of all Rb-Sr isotopic combinations.
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