Physical Review Letters

Bose-Einstein Condensation of Sr84

Y. N. Martinez de Escobar, Pascal G. Mickelson, Mi Yan, B. J. DeSalvo, Sarah Nagel, T. C. Killian

Published Nov 9, 2009• 148 citations

Abstract

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.

DOI: 10.1103/physrevlett.103.200402

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Physical Review Letters

Bose-Einstein Condensation of Sr84

Y. N. Martinez de Escobar, Pascal G. Mickelson, Mi Yan, B. J. DeSalvo, Sarah Nagel, T. C. Killian

Published Nov 9, 2009• 148 citations

Publisher

Abstract

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.

DOI: 10.1103/physrevlett.103.200402

Related papers

Bose-Einstein Condensation of 84-Sr

Y. N. Martinez de Escobar, Pascal G. Mickelson, Mi Yan +3 more

arXiv:0910.3222APSOct 16, 200915 citations

Bose-Einstein condensation of Sr86

Simon Stellmer, Meng Khoon Tey, Rudolf Grimm +1 more

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 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.

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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 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 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 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 ${a}_{170}=3.6\ifmmode\pm\else\textpm\fi{}0.9\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$.