arXiv:1009.1701 · Physical Review A

Bose-Einstein condensation of Sr86

Simon Stellmer, Meng Khoon Tey, Rudolf Grimm, Florian Schreck

Published Oct 21, 2010• 47 citations

Abstract

We report on the attainment of Bose-Einstein condensation of $^{86}\mathrm{Sr}$. This isotope has a scattering length of about $+800{a}_{0}$ and thus suffers from fast three-body losses. To avoid detrimental atom loss, evaporative cooling is performed at low densities around $3\ifmmode\times\else\texttimes\fi{}{10}^{12}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ in a large volume optical dipole trap. We obtain almost pure condensates of $5\ifmmode\times\else\texttimes\fi{}{10}^{3}$ atoms.

DOI: 10.1103/physreva.82.041602

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arXiv:1009.1701 · Physical Review A

Bose-Einstein condensation of Sr86

Simon Stellmer, Meng Khoon Tey, Rudolf Grimm, Florian Schreck

Published Oct 21, 2010• 47 citations

arXiv HTML PDF

Abstract

We report on the attainment of Bose-Einstein condensation of

^{86}\mathrm{Sr}

. This isotope has a scattering length of about

+800{a}_{0}

and thus suffers from fast three-body losses. To avoid detrimental atom loss, evaporative cooling is performed at low densities around

3\ifmmode\times\else\texttimes\fi{}{10}^{12}

{\mathrm{cm}}^{\ensuremath{-}3}

in a large volume optical dipole trap. We obtain almost pure condensates of

5\ifmmode\times\else\texttimes\fi{}{10}^{3}

atoms.

DOI: 10.1103/physreva.82.041602

Related papers

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Bose-Einstein Condensation of Sr84

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We report Bose-Einstein condensation of $^{84}\mathrm{Sr}$ in an optical dipole trap. Efficient laser cooling on the narrow intercombination line and an ideal $s$ -wave scattering length allow the creation of large condensates (${N}_{0}\ensuremath{\sim}3\ifmmode\times\else\texttimes\fi{}{10}^{5}$) even though the natural abundance of this isotope is only 0.6%. Condensation is heralded by the emergence of a low-velocity component in time-of-flight images.We report Bose-Einstein condensation of $^{84}\mathrm{Sr}$ in an optical dipole trap. Efficient laser cooling on the narrow intercombination line and an ideal $s$-wave scattering length allow the creation of large condensates (${N}_{0}\ensuremath{\sim}3\ifmmode\times\else\texttimes\fi{}{10}^{5}$) even though the natural abundance of this isotope is only 0.6%. Condensation is heralded by the emergence of a low-velocity component in time-of-flight images.

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We report on a highly efficient evaporative cooling optimized experimentally. We successfully created sodium Bose-Einstein condensates with 6.4\ifmmode\times\else\texttimes\fi{}10 ${}^{7}$ atoms starting from 6.6\ifmmode\times\else\texttimes\fi{}10 ${}^{9}$ thermal atoms trapped in a magnetic trap by employing a fast linear sweep of radio frequency at the final stage of evaporative cooling so as to overcome the serious three-body losses. The experimental results such as the cooling trajectory and the condensate growth quantitatively agree with the numerical simulations of evaporative cooling on the basis of the kinetic theory of a Bose gas carefully taking into account our specific experimental conditions. We further discuss theoretically a possibility of producing large condensates, more than 10 ${}^{8}$ sodium atoms, by simply increasing the number of initial thermal trapped atoms and the corresponding optimization of evaporative cooling.We report on a highly efficient evaporative cooling optimized experimentally. We successfully created sodium Bose-Einstein condensates with 6.4\ifmmode\times\else\texttimes\fi{}10${}^{7}$ atoms starting from 6.6\ifmmode\times\else\texttimes\fi{}10${}^{9}$ thermal atoms trapped in a magnetic trap by employing a fast linear sweep of radio frequency at the final stage of evaporative cooling so as to overcome the serious three-body losses. The experimental results such as the cooling trajectory and the condensate growth quantitatively agree with the numerical simulations of evaporative cooling on the basis of the kinetic theory of a Bose gas carefully taking into account our specific experimental conditions. We further discuss theoretically a possibility of producing large condensates, more than 10${}^{8}$ sodium atoms, by simply increasing the number of initial thermal trapped atoms and the corresponding optimization of evaporative cooling.

Physical Review ASep 20, 20118 citations

We report on the attainment of Bose-Einstein condensation of

^{86}\mathrm{Sr}

. This isotope has a scattering length of about

+800{a}_{0}

and thus suffers from fast three-body losses. To avoid detrimental atom loss, evaporative cooling is performed at low densities around

3\ifmmode\times\else\texttimes\fi{}{10}^{12}

{\mathrm{cm}}^{\ensuremath{-}3}

in a large volume optical dipole trap. We obtain almost pure condensates of

5\ifmmode\times\else\texttimes\fi{}{10}^{3}

atoms.

We report the observation of a Bose-Einstein condensate in a bosonic isotope of ytterbium

(^{170}\mathrm{Yb})

. More than

{10}^{6}

atoms are trapped in a crossed optical dipole trap and cooled by evaporation. Condensates of approximately

{10}^{4}

atoms have been obtained. From an expansion of the condensate, we have extracted the scattering length ${a}_{170}=3.6\ifmmode\pm\else\textpm\fi{}0.9\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$.

We report Bose-Einstein condensation of

^{88}\mathrm{Sr}

, which has a small, negative

s

-wave scattering length (${a}_{88}=\ensuremath{-}2{a}_{0}$). We overcome the poor evaporative cooling characteristics of this isotope by sympathetic cooling with

^{87}\mathrm{Sr}

atoms.

^{87}\mathrm{Sr}

is effective in this role despite the fact that it is a fermion because of the large ground-state degeneracy arising from a nuclear spin of

I=9/2

, which reduces the impact of Pauli blocking of collisions. We observe a limited number of atoms in the condensate (${N}_{\mathrm{max}}\ensuremath{\approx}{10}^{4}$) that is consistent with the value of

{a}_{88}

and the optical dipole trap parameters.

We report the all-optical production of Bose-Einstein condensates (BEC) of

^{39}\mathrm{K}

atoms. We directly load $3\ifmmode\times\else\texttimes\fi{}{10}^{7}$ atoms in a large volume optical dipole trap from gray molasses on the D1 transition. We then apply a small magnetic quadrupole field to polarize the sample before transferring the atoms in a tightly confining optical trap. Evaporative cooling is finally performed close to a Feshbach resonance to enhance the scattering length. Our setup allows one to cross the BEC threshold with $3\ifmmode\times\else\texttimes\fi{}{10}^{5}$ atoms every 7 s. As an illustration of the interest of the tunability of the interactions we study the expansion of Bose-Einstein condensates in the one-dimensional to three-dimensional crossover.

We report Bose-Einstein condensation of

^{84}\mathrm{Sr}

in an optical dipole trap. Efficient laser cooling on the narrow intercombination line and an ideal

s

-wave scattering length allow the creation of large condensates (${N}_{0}\ensuremath{\sim}3\ifmmode\times\else\texttimes\fi{}{10}^{5}$) even though the natural abundance of this isotope is only 0.6%. Condensation is heralded by the emergence of a low-velocity component in time-of-flight images.

We report on a highly efficient evaporative cooling optimized experimentally. We successfully created sodium Bose-Einstein condensates with 6.4\ifmmode\times\else\texttimes\fi{}10

{}^{7}

atoms starting from 6.6\ifmmode\times\else\texttimes\fi{}10

{}^{9}

thermal atoms trapped in a magnetic trap by employing a fast linear sweep of radio frequency at the final stage of evaporative cooling so as to overcome the serious three-body losses. The experimental results such as the cooling trajectory and the condensate growth quantitatively agree with the numerical simulations of evaporative cooling on the basis of the kinetic theory of a Bose gas carefully taking into account our specific experimental conditions. We further discuss theoretically a possibility of producing large condensates, more than 10

{}^{8}

sodium atoms, by simply increasing the number of initial thermal trapped atoms and the corresponding optimization of evaporative cooling.