arXiv:0802.2591

Studying a dual-species BEC with tunable interactions

Scott B. Papp, Pino, J. M., Carl Wieman

Published Feb 19, 2008• 1 citation

Abstract

We report on the observation of controllable spatial separation in a dual-species Bose-Einstein condensate (BEC) with $^{85}$Rb and $^{87}$Rb. Interparticle interactions between the different components can change the miscibility of the two quantum fluids. In our experiments, we clearly observe the immiscible nature of the two simultaneously Bose-condensed species via their spatial separation. Furthermore the $^{85}$Rb Feshbach resonance near 155 G is used to change them between miscible and immiscible by tuning the $^{85}$Rb scattering length. Our apparatus is also able to create $^{85}$Rb condensates with up to $8\times10^4$ atoms which represents a significant improvement over previous work.

DOI: 10.48550/arxiv.0802.2591

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arXiv:0802.2591

Studying a dual-species BEC with tunable interactions

Scott B. Papp, Pino, J. M., Carl Wieman

Published Feb 19, 2008• 1 citation

arXiv HTML PDF

Abstract

We report on the observation of controllable spatial separation in a dual-species Bose-Einstein condensate (BEC) with

^{85}

Rb and

^{87}

Rb. Interparticle interactions between the different components can change the miscibility of the two quantum fluids. In our experiments, we clearly observe the immiscible nature of the two simultaneously Bose-condensed species via their spatial separation. Furthermore the

^{85}

Rb Feshbach resonance near 155 G is used to change them between miscible and immiscible by tuning the

^{85}

Rb scattering length. Our apparatus is also able to create

^{85}

Rb condensates with up to

8\times10^4

atoms which represents a significant improvement over previous work.

DOI: 10.48550/arxiv.0802.2591

Related papers

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We report on the observation of controllable phase separation in a dual-species Bose-Einstein condensate with 85Rb and 87Rb. Interatomic interactions between the different components determine the miscibility of the two quantum fluids. In our experiments, we can clearly observe immiscible behavior via a dramatic spatial separation of the two species. Furthermore, a magnetic-field Feshbach resonance is used to change them between miscible and immiscible by tuning the 85Rb scattering length. The spatial density pattern of the immiscible quantum fluids exhibits complex alternating-domain structures that are uncharacteristic of its stationary ground state.We report on the observation of controllable phase separation in a dual-species Bose-Einstein condensate with 85Rb and 87Rb. Interatomic interactions between the different components determine the miscibility of the two quantum fluids. In our experiments, we can clearly observe immiscible behavior via a dramatic spatial separation of the two species. Furthermore, a magnetic-field Feshbach resonance is used to change them between miscible and immiscible by tuning the 85Rb scattering length. The spatial density pattern of the immiscible quantum fluids exhibits complex alternating-domain structures that are uncharacteristic of its stationary ground state.

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May 30, 20135 citations

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P. A. Altin, Nicholas P. Robins, D. Döring +4 more

We describe our experimental setup for creating stable Bose-Einstein condensates (BECs) of (85)Rb with tunable interparticle interactions. We use sympathetic cooling with (87)Rb in two stages, initially in a tight Ioffe-Pritchard magnetic trap and subsequently in a weak, large-volume, crossed optical dipole trap, using the 155 G Feshbach resonance to manipulate the elastic and inelastic scattering properties of the (85)Rb atoms. Typical (85)Rb condensates contain 4 x 10(4) atoms with a scattering length of a=+200a(0). Many aspects of the design presented here could be adapted to other dual-species BEC machines, including those involving degenerate Fermi-Bose mixtures. Our minimalist apparatus is well suited to experiments on dual-species and spinor Rb condensates, and has several simplifications over the (85)Rb BEC machine at JILA, which we discuss at the end of this article.We describe our experimental setup for creating stable Bose-Einstein condensates (BECs) of (85)Rb with tunable interparticle interactions. We use sympathetic cooling with (87)Rb in two stages, initially in a tight Ioffe-Pritchard magnetic trap and subsequently in a weak, large-volume, crossed optical dipole trap, using the 155 G Feshbach resonance to manipulate the elastic and inelastic scattering properties of the (85)Rb atoms. Typical (85)Rb condensates contain 4 x 10(4) atoms with a scattering length of a=+200a(0). Many aspects of the design presented here could be adapted to other dual-species BEC machines, including those involving degenerate Fermi-Bose mixtures. Our minimalist apparatus is well suited to experiments on dual-species and spinor Rb condensates, and has several simplifications over the (85)Rb BEC machine at JILA, which we discuss at the end of this article.

arXiv:1003.4819Review of Scientific InstrumentsJun 1, 201040 citations

We report on the observation of controllable spatial separation in a dual-species Bose-Einstein condensate (BEC) with

^{85}

Rb and

^{87}

^{85}

Rb Feshbach resonance near 155 G is used to change them between miscible and immiscible by tuning the

^{85}

Rb scattering length. Our apparatus is also able to create

^{85}

Rb condensates with up to

8\times10^4

atoms which represents a significant improvement over previous work.

^{23}

Na and

^{87}

Rb double Bose-Einstein condensate with tunable interactions

We have realized a dual-species Bose-Einstein condensate of

^{23}

Na and

^{87}

Rb atoms and observed their immiscibility. Because of the favorite background intra- and inter-species scattering lengths, evaporative cooling and sympathetic cooling are efficient without the need for fine controlling of the interactions. Our system thus provides a clean platform for studying quantum fluid mixtures with tunable inter-species interactions. We have also demonstrated the interaction tuning with a inter-species Feshbach resonance by investigating the elastic collisions near zero crossing of the Na-Rb scattering length.

We present the production of dual-species Bose-Einstein condensates (BECs) of

^{39}\mathrm{K}

and

^{87}\mathrm{Rb}

. Preparation of both species in the $\left|F=1,{m}_{F}=\ensuremath{-}1\right\ensuremath{\rangle}$ state enabled us to exploit a total of three Feshbach resonances, which allows for simultaneous Feshbach tuning of the

^{39}\mathrm{K}

intraspecies and the $^{39}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ interspecies scattering length. Thus dual-species Bose-Einstein condensates were produced by sympathetic cooling of

^{39}\mathrm{K}

with

^{87}\mathrm{Rb}

. A dark spontaneous force optical trap was used for

^{87}\mathrm{Rb}

to reduce the losses in

^{39}\mathrm{K}

due to light-assisted collisions in the optical trapping phase, which can be of benefit for other dual-species experiments. The tunability of the scattering length was used to perform precision spectroscopy of the interspecies Feshbach resonance located at 117.56(2) G and to determine the width of the resonance to 1.21(5) G by rethermalization measurements. The transition region from miscible to immiscible dual-species condensates was investigated and the interspecies background scattering length was determined to

28.5{a}_{0}

using an empirical model. This paves the way for dual-species experiments with

^{39}\mathrm{K}

and

^{87}\mathrm{Rb}

BECs ranging from molecular physics to precision metrology.