Bose-Einstein condensation of alkaline earth atoms: $^{40}${Ca}

Details Bose-Einstein condensation of alkaline earth atoms: $^{40}${Ca} Bose-Einstein condensation of alkaline earth atoms: $^{40}${Ca}

2009-08-03

arxiv.org/abs/0908.0248v2

Phys. Rev. Lett. 103, 130401 (2009)

Physics

Condensed Matter

Quantum Gases

Scientific paper

10.1103/PhysRevLett.103.130401

We have achieved Bose-Einstein condensation of $^{40}$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 $^{40}$Ca was measured. From these findings, an optimized loading and cooling scheme was developed that allowed us to condense about $2 \cdot 10^4$ 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 $^1$S--$^3$P asymptotes.

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