arXiv:1107.0107 · Physical Review A

Bose-Einstein condensate in gases of rare atomic species

Seiji Sugawa, Rekishu Yamazaki, Shintaro Taie, Yoshiro Takahashi

Published Jul 27, 2011• 73 citations

Abstract

We report on the successful extension of production of a Bose-Einstein condensate (BEC) to a rare atomic species. Despite its low natural abundance of 0.13%, ${}^{168}$Yb is directly evaporatively cooled down to a BEC. Our successful demonstration encourages attempts to obtain quantum gases of radioactive atoms, which extends the possibility of quantum many-body physics and precision measurement. Moreover, a stable binary mixture of ${}^{168}$Yb BEC and ${}^{174}$Yb BEC is successfully formed.

DOI: 10.1103/physreva.84.011610

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arXiv:1107.0107 · Physical Review A

Bose-Einstein condensate in gases of rare atomic species

Seiji Sugawa, Rekishu Yamazaki, Shintaro Taie, Yoshiro Takahashi

Published Jul 27, 2011• 73 citations

arXiv HTML PDF

Abstract

We report on the successful extension of production of a Bose-Einstein condensate (BEC) to a rare atomic species. Despite its low natural abundance of 0.13%,

{}^{168}

Yb is directly evaporatively cooled down to a BEC. Our successful demonstration encourages attempts to obtain quantum gases of radioactive atoms, which extends the possibility of quantum many-body physics and precision measurement. Moreover, a stable binary mixture of

{}^{168}

Yb BEC and

{}^{174}

Yb BEC is successfully formed.

DOI: 10.1103/physreva.84.011610

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Y.-D. Chen, W. -X. Li, Y.-T. Sun +3 more

We report the creation of dual-species Bose-Einstein condensates (BECs) of $^{7}$ Li and $^{133}$ Cs. These BECs are formed in a bichromatic optical dipole trap created with 1550-nm and 780-nm laser beams. During the production process, an external magnetic field of 886~G is applied to adjust the scattering lengths to $a_{\rm{Cs}} = 123a_0$ , $a_{\rm{Li}} = 484a_0$ , and $a_{\rm{LiCs}} = 248a_0$ . These scattering lengths allow for efficient evaporation and sympathetic cooling. The dual-species BECs are typically produced with $1.5\times 10^4$ Cs atoms and $6.0\times 10^3$ Li atoms. This quantum degenerate mixture of Li and Cs provides an ideal platform for exploring phenomena such as polarons and Efimov trimers, as well as for creating ground-state LiCs molecules.We report the creation of dual-species Bose-Einstein condensates (BECs) of $^{7}$Li and $^{133}$Cs. These BECs are formed in a bichromatic optical dipole trap created with 1550-nm and 780-nm laser beams. During the production process, an external magnetic field of 886~G is applied to adjust the scattering lengths to $a_{\rm{Cs}} = 123a_0$, $a_{\rm{Li}} = 484a_0$, and $a_{\rm{LiCs}} = 248a_0$. These scattering lengths allow for efficient evaporation and sympathetic cooling. The dual-species BECs are typically produced with $1.5\times 10^4$ Cs atoms and $6.0\times 10^3$ Li atoms. This quantum degenerate mixture of Li and Cs provides an ideal platform for exploring phenomena such as polarons and Efimov trimers, as well as for creating ground-state LiCs molecules.

arXiv:2306.02698Jun 5, 20230 citations

We report on the successful extension of production of a Bose-Einstein condensate (BEC) to a rare atomic species. Despite its low natural abundance of 0.13%,

{}^{168}

{}^{168}

Yb BEC and

{}^{174}

Yb BEC is successfully formed.

We have produced a quantum degenerate mixture of fermionic alkali-metal

{}^{6}

Li and bosonic spin-singlet

{}^{174}

Yb gases. This was achieved using sympathetic cooling of lithium atoms by evaporatively cooled ytterbium atoms in a far-off-resonant optical dipole trap. We observe the coexistence of Bose-condensed ($T/{T}_{\mathrm{c}}\ensuremath{\simeq}0.8$)

{}^{174}

Yb with $2.3\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms and Fermi degenerate ($T/{T}_{\mathrm{F}}\ensuremath{\simeq}0.3$)

{}^{6}

Li with $1.2\ifmmode\times\else\texttimes\fi{}{10}^{4}$ atoms. Quasipure Bose-Einstein condensates of up to $3\ifmmode\times\else\texttimes\fi{}{10}^{4}$

{}^{174}

Yb atoms can be produced in single-species experiments. Our results mark a significant step toward studies of few- and many-body physics with mixtures of alkali-metal and alkaline-earth-metal-like atoms, and for the production of paramagnetic polar molecules in the quantum regime. Our methods also establish a convenient scheme for producing quantum degenerate ytterbium atoms in a 1064 nm optical dipole trap.

Dual-species Bose-Einstein condensates of

^{7}

Li and

^{133}

We report the creation of dual-species Bose-Einstein condensates (BECs) of

^{7}

Li and

^{133}

Cs. These BECs are formed in a bichromatic optical dipole trap created with 1550-nm and 780-nm laser beams. During the production process, an external magnetic field of 886~G is applied to adjust the scattering lengths to

a_{\rm{Cs}} = 123a_0

a_{\rm{Li}} = 484a_0

, and

a_{\rm{LiCs}} = 248a_0

. These scattering lengths allow for efficient evaporation and sympathetic cooling. The dual-species BECs are typically produced with

1.5\times 10^4

Cs atoms and

6.0\times 10^3

Li atoms. This quantum degenerate mixture of Li and Cs provides an ideal platform for exploring phenomena such as polarons and Efimov trimers, as well as for creating ground-state LiCs molecules.