Bose-Einstein Condensation and Spin Mixtures of Optically Trapped Metastable Helium

Details Bose-Einstein Condensation and Spin Mixtures of Optically Trapped Metastable Helium Bose-Einstein Condensation and Spin Mixtures of Optically Trapped Metastable Helium

2010-03-24

arxiv.org/abs/1003.4641v1

Physical Review A 81 053631 (2010)

Physics

Condensed Matter

Quantum Gases

Scientific paper

10.1103/PhysRevA.81.053631

We report the realization of a BEC of metastable helium-4 atoms (4He*) in an all optical potential. Up to 10^5 spin polarized 4He* atoms are condensed in an optical dipole trap formed from a single, focused, vertically propagating far off-resonance laser beam. The vertical trap geometry is chosen to best match the resolution characteristics of a delay-line anode micro-channel plate detector capable of registering single He* atoms. We also confirm the instability of certain spin state combinations of 4He* to two-body inelastic processes, which necessarily affects the scope of future experiments using optically trapped spin mixtures. In order to better quantify this constraint, we measure spin state resolved two-body inelastic loss rate coefficients in the optical trap.

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