Double Degenerate Bose-Fermi Mixture of Strontium and Lithium

Abstract

We report on the attainment of a degenerate Fermi gas of ${}^6\mathrm{Li}$ in contact with a Bose-Einstein condensate (BEC) of ${}^{84}$Sr. A degeneracy of $T/T_F=0.33(3)$ is observed with $1.6\times 10^5$ ${}^6$Li atoms in the two lowest energy hyperfine states together with an almost pure BEC of $3.1\times 10^5$ ${}^{84}$Sr atoms. The elastic s-wave scattering length between ${}^6$Li and ${}^{84}$Sr is estimated to be $|a_{{}^6\mathrm{Li}-{}^{84}\mathrm{Sr}}|=(7.1_{-1.7}^{+2.6})a_0$ ($a_0$ being the Bohr radius) from measured interspecies thermalization rates in an optical dipole trap.

8 pages, 6 figures

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