title: Sympathetic cooling in an optically trapped mixture of alkali and spin-singlet atoms.
abstract: We report on the realization of a stable mixture of ultracold lithium and ytterbium atoms confined in a far-off-resonance optical dipole trap. We observe sympathetic cooling of 6Li by 174Yb and extract the s-wave scattering length magnitude |a(6Li-174Yb)|=(13±3)a0 from the rate of interspecies thermalization. Using forced evaporative cooling of 174Yb, we achieve reduction of the 6Li temperature to below the Fermi temperature, purely through interspecies sympathetic cooling.
authors.affiliation: Department of Physics, University of Washington, Seattle, Washington 98195, USA.
authors.forename: Vladyslav V
authors.initials: VV
authors.lastname: Ivanov
authors.forename: Alexander
authors.initials: A
authors.lastname: Khramov
authors.forename: Anders H
authors.initials: AH
authors.lastname: Hansen
authors.forename: William H
authors.initials: WH
authors.lastname: Dowd
authors.forename: Frank
authors.initials: F
authors.lastname: Münchow
authors.forename: Alan O
authors.initials: AO
authors.lastname: Jamison
authors.forename: Subhadeep
authors.initials: S
authors.lastname: Gupta