Bose-Einstein condensation of alkaline earth atoms: $^{40}${Ca}
Sebastian Kraft, Felix Vogt, Oliver Appel, Fritz Riehle, and Uwe Sterr

TL;DR
This paper reports the first achievement of Bose-Einstein condensation in an alkaline earth atom, specifically $^{40}$Ca, enabling new research avenues in precision measurement and molecular physics.
Contribution
The paper demonstrates Bose-Einstein condensation of $^{40}$Ca and develops an optimized cooling scheme for alkaline earth atoms, a novel achievement in the field.
Findings
Achieved Bose-Einstein condensation of $^{40}$Ca with about 20,000 atoms.
Measured elastic and inelastic collision effects related to the large scattering length.
Developed a rapid, efficient cooling and condensation process within 3 seconds.
Abstract
We have achieved Bose-Einstein condensation of Ca, the first for an alkaline earth element. The influence of elastic and inelastic collisions associated with the large ground state s-wave scattering length of Ca was measured. From these findings, an optimized loading and cooling scheme was developed that allowed us to condense about atoms after laser cooling in a two-stage magneto-optical trap and subsequent forced evaporation in a crossed dipole trap within less than 3 s. The condensation of an alkaline earth element opens novel opportunities for precision measurements on the narrow intercombination lines as well as investigations of molecular states at the S--P asymptotes.
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