Magnetic trapping of an atomic ^5^5Mn-^5^2Cr mixture (3 pages)

P Tierney and S L Cornish M L Harris

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Margaret Harris, Patrick Tierney, Simon L. Cornish

We present an apparatus for the study of an ultracold gaseous atomic mixture of 133Cs and 87Rb. The mixture is prepared using a double magneto-optical trap (MOT) system in which a two-species pyramid MOT acts as a source of cold atoms for a `science' MOT. Measurements of the interspecies trap loss rate coefficients beta_RbCs and beta_CsRb in the science MOT are reported. After the initial MOT phase, atoms in the mixture are optically pumped into the magnetically trappable |F=3,m_F=-3> and |F=1,m_F=-1> states of Cs and Rb (respectively) and loaded into an Ioffe-Pritchard magnetic trap. We demonstrate a novel technique for limiting the interspecies loss rate in the science MOT by spatially separating the two trapped atom clouds, which greatly enhances the number of atoms which can be loaded into the magnetic trap.

Harold J. Metcalf, P. van der Straten

Michael Brown-Hayes, Roberto Onofrio

We discuss cooling efficiency for different-species Fermi-Bose mixtures in magnetic traps. A better heat capacity matching between the two atomic species is achieved by a proper choice of the Bose cooler and the magnetically trappable hyperfine states of the mixture. When a partial spatial overlap between the two species is also taken into account, the deepest Fermi degeneracy is obtained for an optimal value of the trapping frequency ratio between the two species. This can be achieved by assisting the magnetic trap with a deconfining light beam, as shown in the case of fermionic $^{6}\mathrm{Li}$ mixed with $^{23}\mathrm{Na}$, $^{87}\mathrm{Rb}$, and $^{133}\mathrm{Cs}$, with optimal conditions found for the not yet explored $^{6}\mathrm{Li}\penalty1000-\hskip0pt^{87}\mathrm{Rb}$ mixture.

Tin-Lun Ho, Vivek B. Shenoy

The hydrodynamics equations of binary mixtures of Bose gases, Fermi gases, and mixtures of Bose and Fermi gases in the presence of external potentials are derived. These equations can be applied to current experiments on mixtures of atomic gases confined in magnetic traps.

Matthew T. Hummon