We have produced a macroscopic quantum system in which a ${}^{6}\mathrm{Li}$ Fermi sea coexists with a large and stable ${}^{23}\mathrm{Na}$ Bose-Einstein condensate. This was accomplished using interspecies sympathetic cooling of fermionic ${}^{6}\mathrm{Li}$ in a thermal bath of bosonic ${}^{23}\mathrm{Na}$ . The system features rapid thermalization and long lifetimes.We have produced a macroscopic quantum system in which a ${}^{6}\mathrm{Li}$ Fermi sea coexists with a large and stable ${}^{23}\mathrm{Na}$ Bose-Einstein condensate. This was accomplished using interspecies sympathetic cooling of fermionic ${}^{6}\mathrm{Li}$ in a thermal bath of bosonic ${}^{23}\mathrm{Na}$. The system features rapid thermalization and long lifetimes.

arXiv:cond-mat/0112425Physical Review LettersApr 4, 2002464 citations

Quantum Degenerate Two-Species Fermi-Fermi Mixture Coexisting with a Bose-Einstein Condensate

M. Taglieber, A.-C. Voigt, T. Aoki +2 more

We report on the generation of a quantum degenerate Fermi-Fermi mixture of two different atomic species. The quantum degenerate mixture is realized employing sympathetic cooling of fermionic 6Li and 40K gases by an evaporatively cooled bosonic 87Rb gas. We describe the combination of trapping and cooling methods that proved crucial to successfully cool the mixture. In particular, we study the last part of the cooling process and show that the efficiency of sympathetic cooling of the 6Li gas by 87Rb is increased by the presence of 40K through catalytic cooling. Because of the differing physical properties of the two components, the quantum degenerate 6Li-40K Fermi-Fermi mixture is an excellent candidate for a stable, heteronuclear system allowing the study of several so far unexplored types of quantum matter.We report on the generation of a quantum degenerate Fermi-Fermi mixture of two different atomic species. The quantum degenerate mixture is realized employing sympathetic cooling of fermionic 6Li and 40K gases by an evaporatively cooled bosonic 87Rb gas. We describe the combination of trapping and cooling methods that proved crucial to successfully cool the mixture. In particular, we study the last part of the cooling process and show that the efficiency of sympathetic cooling of the 6Li gas by 87Rb is increased by the presence of 40K through catalytic cooling. Because of the differing physical properties of the two components, the quantum degenerate 6Li-40K Fermi-Fermi mixture is an excellent candidate for a stable, heteronuclear system allowing the study of several so far unexplored types of quantum matter.

arXiv:0710.2779Physical Review LettersJan 4, 2008265 citations

We have produced a macroscopic quantum system in which a

{}^{6}\mathrm{Li}

Fermi sea coexists with a large and stable

{}^{23}\mathrm{Na}

Bose-Einstein condensate. This was accomplished using interspecies sympathetic cooling of fermionic

{}^{6}\mathrm{Li}

in a thermal bath of bosonic

{}^{23}\mathrm{Na}

. The system features rapid thermalization and long lifetimes.