Sympathetic cooling in a mixture of diamagnetic and paramagnetic atoms

Authors :: Tassy, S.
Nemitz, N.
Baumer, F.
Höhl, C.
Batär, A.
Görlitz, A.
Publication Year :: 2007
Abstract: We have experimentally realized a hybrid trap for ultracold paramagnetic rubidium and diamagnetic ytterbium atoms by combining a bichromatic optical dipole trap for ytterbium with a Ioffe-Pritchard-type magnetic trap for rubidium. In this hybrid trap, sympathetic cooling of five different ytterbium isotopes through elastic collisions with rubidium was achieved. A strong dependence of the interspecies collisional cross section on the mass of the ytterbium isotope was observed.<br />Comment: 4 pages, 4 figures