Quantum-Atom Optics Downunder (QAO)

Towards Production of a Dual Species Metastable Helium-Rubidium Bose-Einstein Condensate

L. J. Byron, R. G. Dall, Andrew G. Truscott

Published Jan 1, 2007• 0 citations

Abstract

We present progress towards the production of the first dual species metastable Helium (He*)-87Rb Bose-Einstein Condensate (BEC). The production of a He*-Rb binary BEC would allow for studies of Penning and associative ionization, photoassociative spectroscopy and eventually for a study of bound ultracold He*Rb molecules. The production of a He*-Rb BEC will be realised by modifying the existing He* BEC experiment at the Australian National University [1].

DOI: 10.1364/qao.2007.qme12

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Tunable dual-species Bose-Einstein condensates of K39 and Rb87

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Quantum-Atom Optics Downunder (QAO)

Towards Production of a Dual Species Metastable Helium-Rubidium Bose-Einstein Condensate

L. J. Byron, R. G. Dall, Andrew G. Truscott

Published Jan 1, 2007• 0 citations

Publisher

Abstract

We present progress towards the production of the first dual species metastable Helium (He*)-87Rb Bose-Einstein Condensate (BEC). The production of a He*-Rb binary BEC would allow for studies of Penning and associative ionization, photoassociative spectroscopy and eventually for a study of bound ultracold HeRb molecules. The production of a He-Rb BEC will be realised by modifying the existing He* BEC experiment at the Australian National University [1].

DOI: 10.1364/qao.2007.qme12

Related papers

Laser Spectroscopy of Ultracold Metastable Helium Atoms

L. J. Byron, Oscar Turazza, R. G. Dall +2 more

Frontiers in OpticsJan 1, 20060 citations

Tunable dual-species Bose-Einstein condensates of K39 and Rb87

L. J. Wacker, Nils B. Jørgensen, Dorthe Birkmose +6 more

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.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.

arXiv:1505.07975Physical Review ANov 4, 2015102 citations

Suppression of Penning ionization in a spin-polarized mixture of rubidium and He*

L. J. Byron, R. G. Dall, RuGway Wu +1 more

This paper presents the first study of the collision dynamics of an ultra-cold spin-polarized mixture of rubidium and metastable helium (He * ) atoms. Our experiment monitors ion production from the mixture for both magnetically polarized and unpolarized cases. In the unpolarized case, we observe an increase in our background ion rate. However, in the completely polarized sample the ion production is below the sensitivity of our experiment. Nonetheless, we determine an upper limit of 5 × 10 −12 cm 3 s −1 for the polarized rate constant (β Rb-He * ), which is two orders of magnitude below the unpolarized rate constant. Such a suppression of the He * – 87 Rb polarized rate was not apparent a priori and opens the intriguing possibility of creating a dual Bose–Einstein condensate comprising an alkali ground-state atom and an excited-state noble-gas atom.This paper presents the first study of the collision dynamics of an ultra-cold spin-polarized mixture of rubidium and metastable helium (He * ) atoms. Our experiment monitors ion production from the mixture for both magnetically polarized and unpolarized cases. In the unpolarized case, we observe an increase in our background ion rate. However, in the completely polarized sample the ion production is below the sensitivity of our experiment. Nonetheless, we determine an upper limit of 5 × 10 −12 cm 3 s −1 for the polarized rate constant (β Rb-He * ), which is two orders of magnitude below the unpolarized rate constant. Such a suppression of the He * – 87 Rb polarized rate was not apparent a priori and opens the intriguing possibility of creating a dual Bose–Einstein condensate comprising an alkali ground-state atom and an excited-state noble-gas atom.

New Journal of PhysicsJan 13, 201016 citations

Trap loss in a metastable helium-rubidium magneto-optical trap

L. J. Byron, R. G. Dall, Andrew G. Truscott

We present results of the study of a simultaneously confined metastable helium (He ${}^{*}$ ) and rubidium magneto-optical trap (MOT). By monitoring the trap decay of the $^{87}\mathrm{Rb}$ MOT with and without a He ${}^{*}$ MOT present, we find the light-assisted, two-body loss rate to be ${\ensuremath{\beta}}_{\mathrm{Rb}--{\mathrm{He}}^{*}}=(6\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10} {\mathrm{cm}}^{3}/\mathrm{s}$. Moreover, we find that it is possible to create a large, robust $^{87}\mathrm{Rb}$ -He ${}^{*}$ MOT, opening the possibility of creating a $^{87}\mathrm{Rb}$ -He ${}^{*}$ Bose-Einstein condensate. This would be the first dual-species condensate incorporating an alkali metal ground-state atom and an excited-state noble gas atom.We present results of the study of a simultaneously confined metastable helium (He${}^{*}$) and rubidium magneto-optical trap (MOT). By monitoring the trap decay of the $^{87}\mathrm{Rb}$ MOT with and without a He${}^{*}$ MOT present, we find the light-assisted, two-body loss rate to be ${\ensuremath{\beta}}_{\mathrm{Rb}--{\mathrm{He}}^{*}}=(6\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10} {\mathrm{cm}}^{3}/\mathrm{s}$. Moreover, we find that it is possible to create a large, robust $^{87}\mathrm{Rb}$-He${}^{*}$ MOT, opening the possibility of creating a $^{87}\mathrm{Rb}$-He${}^{*}$ Bose-Einstein condensate. This would be the first dual-species condensate incorporating an alkali metal ground-state atom and an excited-state noble gas atom.

Physical Review AJan 6, 201012 citations

Laser cooling and trapping, Bose Einstein Condensation, the case of metastable helium

Michèle Leduc

This article first provides guide lines for the understanding of laser cooling and Bose Einstein Condensation, with a general bibliography of the domain. Some details are given about the case of an ultracold gas of helium atoms in the 23S1 metastable state. Obtention of BEC will be recalled, with discussion of the inhibition of Penning ionization collisions. Recent studies at ENS with photoassociation methods will be summarized, including the formation of giant dimers providing another example of ionization inhibition.This article first provides guide lines for the understanding of laser cooling and Bose Einstein Condensation, with a general bibliography of the domain. Some details are given about the case of an ultracold gas of helium atoms in the 23S1 metastable state. Obtention of BEC will be recalled, with discussion of the inhibition of Penning ionization collisions. Recent studies at ENS with photoassociation methods will be summarized, including the formation of giant dimers providing another example of ionization inhibition.

AIP conference proceedingsJan 1, 20050 citations

Production of dual species Bose–Einstein condensates of 39K and 87Rb*

Cheng-Dong Mi, Khan Sadiq Nawaz, Peng-Jun Wang +4 more

We report the production of 39K and 87Rb Bose–Einstein condensates (BECs) in the lowest hyperfine states | F = 1,mF = 1 〉 simultaneously. We collect atoms in bright/dark magneto-optical traps (MOTs) of 39K/87Rb to overcome the light-assisted losses of 39K atoms. Gray molasses cooling on the D1 line of the 39K is used to effectively increase the phase density, which improves the loading efficiency of 39K into the quadrupole magnetic trap. Simultaneously, the normal molasses is employed for 87Rb. After the microwave evaporation cooling on 87Rb in the optically plugged magnetic trap, the atoms mixture is transferred to a crossed optical dipole trap, where the collisional properties of the two species in different combinations of the hyperfine states are studied. The dual species BECs of 39K and 87Rb are obtained by further evaporative cooling in an optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length a KRb = 34 a 0 (a 0 is the Bohr radius) and the intraspecies scattering length a K = 20.05a 0.We report the production of 39K and 87Rb Bose–Einstein condensates (BECs) in the lowest hyperfine states | F = 1,mF = 1 〉 simultaneously. We collect atoms in bright/dark magneto-optical traps (MOTs) of 39K/87Rb to overcome the light-assisted losses of 39K atoms. Gray molasses cooling on the D1 line of the 39K is used to effectively increase the phase density, which improves the loading efficiency of 39K into the quadrupole magnetic trap. Simultaneously, the normal molasses is employed for 87Rb. After the microwave evaporation cooling on 87Rb in the optically plugged magnetic trap, the atoms mixture is transferred to a crossed optical dipole trap, where the collisional properties of the two species in different combinations of the hyperfine states are studied. The dual species BECs of 39K and 87Rb are obtained by further evaporative cooling in an optical dipole trap at a magnetic field of 372.6 G with the background repulsive interspecies scattering length a KRb = 34 a 0 (a 0 is the Bohr radius) and the intraspecies scattering length a K = 20.05a 0.

arXiv:2104.09728Chinese Physics BMar 15, 20216 citations

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.

We present results of the study of a simultaneously confined metastable helium (He

{}^{*}

) and rubidium magneto-optical trap (MOT). By monitoring the trap decay of the

^{87}\mathrm{Rb}

MOT with and without a He

{}^{*}

MOT present, we find the light-assisted, two-body loss rate to be ${\ensuremath{\beta}}_{\mathrm{Rb}--{\mathrm{He}}^{*}}=(6\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10} {\mathrm{cm}}^{3}/\mathrm{s}$. Moreover, we find that it is possible to create a large, robust

^{87}\mathrm{Rb}

-He

{}^{*}

MOT, opening the possibility of creating a

^{87}\mathrm{Rb}

-He

{}^{*}

Bose-Einstein condensate. This would be the first dual-species condensate incorporating an alkali metal ground-state atom and an excited-state noble gas atom.