Prospect for BEC in a cesium gas: one-dimensional evaporative cooling in a hybrid magnetic and optical trap
Laboratoire Aimé Cotton (Laboratoire Aimé Cotton is associated with University of Paris-Sud.) , CNRS II, Bâtiment 505, Campus d'Orsay, 91405 Orsay, France
Revised: 25 July 2003
Published online: 2 December 2003
Bose-Einstein condensation (BEC) in a atomic cesium gas prepared in a “low field seeker” Zeeman sublevel and confined in a magnetic trap has been thwarted by a high cross-section of inelastic spin-flip collisions. A recent experiment  succeeded in reaching BEC for cesium atoms using all optical methods and tuning the scattering length. We will discuss a hybrid magnetic and optical trap for cesium atoms in the true hyperfine ground state, the “high field seeker” Zeeman sublevel, . Although this trap allows only one-dimensional (1D) evaporative cooling, we show that a route towards BEC with such a trap should be possible. We present simulations of 1D evaporative cooling, which shows that a high phase space density (PSD) of 0.1 could be reached in less than 10 seconds.
PACS: 03.75.Hh – Static properties of condensates; thermodynamical, statistical and structural properties / 05.30.Jp – Boson systems / 32.80.Pj – Optical cooling of atoms; trapping
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004