arXiv:2404.01098

Measurement of three-body recombination coefficient of ultracold lithium and strontium atoms

Boyang Wang, Yifan Wang, Zi-He An, Li-Yang Xie, Zhu-Xiong Ye, Yi Zhang, Meng Khoon Tey

Published Apr 1, 2024• 0 citations

Abstract

We report on the observation of a conspicuous loss in an ultracold mixture of $^{7}$Li and $^{88}$Sr atoms confined in a far-off-resonance optical dipole trap. We attribute the trap loss to the three-body inelastic Li-Sr-Sr collision and extract the corresponding three-body recombination coefficient $K_3$ at $T\sim 18.5,45,70,600$ $μK$. The measured three-body recombination coefficient is about two to three orders of magnitude larger than the typical values convenient for realizing quantum degenerate gases. It also indicates a potentially large $s$-wave scattering length between the bosonic $^{7}$Li and $^{88}$Sr atoms, and essentially rules out the prospect of realizing $^7$Li and $^{88}$Sr mixtures of high phase space density.

DOI: 10.48550/arxiv.2404.01098

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arXiv:2404.01098

Measurement of three-body recombination coefficient of ultracold lithium and strontium atoms

Boyang Wang, Yifan Wang, Zi-He An, Li-Yang Xie, Zhu-Xiong Ye, Yi Zhang, Meng Khoon Tey

Published Apr 1, 2024• 0 citations

arXiv HTML PDF

Abstract

We report on the observation of a conspicuous loss in an ultracold mixture of

^{7}

Li and

^{88}

Sr atoms confined in a far-off-resonance optical dipole trap. We attribute the trap loss to the three-body inelastic Li-Sr-Sr collision and extract the corresponding three-body recombination coefficient

K_3

T\sim 18.5,45,70,600

μK

. The measured three-body recombination coefficient is about two to three orders of magnitude larger than the typical values convenient for realizing quantum degenerate gases. It also indicates a potentially large

s

-wave scattering length between the bosonic

^{7}

Li and

^{88}

Sr atoms, and essentially rules out the prospect of realizing

^7

Li and

^{88}

Sr mixtures of high phase space density.

DOI: 10.48550/arxiv.2404.01098

Related papers

Measurement of the three-body-recombination coefficient of ultracold lithium and strontium atoms

Boyang Wang, Yifan Wang, Zi-He An +4 more

We report on the observation of a conspicuous loss in an ultracold mixture of $^{7}\mathrm{Li}$ and $^{88}\mathrm{Sr}$ atoms confined in a far-off-resonance optical dipole trap. We attribute the trap loss to the three-body inelastic Li-Sr-Sr collision and extract the corresponding three-body-recombination coefficient ${K}_{3}$ at $T\ensuremath{\sim}18.5,45,70,600\phantom{\rule{0.28em}{0ex}}\textmu{}\mathrm{K}$. The measured three-body-recombination coefficient is about two to three orders of magnitude larger than the typical values convenient for realizing quantum degenerate gases, and essentially rules out the prospect of realizing $^{7}\mathrm{Li}$ and $^{88}\mathrm{Sr}$ mixtures of high phase space density. The measured three-body-recombination rates agree with the unitarity limit at high temperatures. Our results also confirm that the three-body-recombination loss is dominated by the light-heavy-heavy process, in agreement with the prediction for a system with a large mass-imbalanced and negligible intraspecies interaction.We report on the observation of a conspicuous loss in an ultracold mixture of $^{7}\mathrm{Li}$ and $^{88}\mathrm{Sr}$ atoms confined in a far-off-resonance optical dipole trap. We attribute the trap loss to the three-body inelastic Li-Sr-Sr collision and extract the corresponding three-body-recombination coefficient ${K}_{3}$ at $T\ensuremath{\sim}18.5,45,70,600\phantom{\rule{0.28em}{0ex}}\textmu{}\mathrm{K}$. The measured three-body-recombination coefficient is about two to three orders of magnitude larger than the typical values convenient for realizing quantum degenerate gases, and essentially rules out the prospect of realizing $^{7}\mathrm{Li}$ and $^{88}\mathrm{Sr}$ mixtures of high phase space density. The measured three-body-recombination rates agree with the unitarity limit at high temperatures. Our results also confirm that the three-body-recombination loss is dominated by the light-heavy-heavy process, in agreement with the prediction for a system with a large mass-imbalanced and negligible intraspecies interaction.

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We report on the observation of two Feshbach resonances in collisions between ultracold $^{6}\mathrm{Li}$ and $^{87}\mathrm{Rb}$ atoms in their respective hyperfine ground states $\ensuremath{\mid}F,{m}_{F}⟩=\ensuremath{\mid}1∕2,1∕2⟩$ and \ensuremath{\mid}1,1⟩. The resonances show up as trap losses for the $^{6}\mathrm{Li}$ cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at $1066.92\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow $p$ -wave Feshbach resonance in collisions of $^{6}\mathrm{Li}$ atoms at $158.55\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ in the presence of a dense $^{87}\mathrm{Rb}$ cloud. The effect of the $^{87}\mathrm{Rb}$ cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.We report on the observation of two Feshbach resonances in collisions between ultracold $^{6}\mathrm{Li}$ and $^{87}\mathrm{Rb}$ atoms in their respective hyperfine ground states $\ensuremath{\mid}F,{m}_{F}⟩=\ensuremath{\mid}1∕2,1∕2⟩$ and \ensuremath{\mid}1,1⟩. The resonances show up as trap losses for the $^{6}\mathrm{Li}$ cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at $1066.92\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow $p$-wave Feshbach resonance in collisions of $^{6}\mathrm{Li}$ atoms at $158.55\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ in the presence of a dense $^{87}\mathrm{Rb}$ cloud. The effect of the $^{87}\mathrm{Rb}$ cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.

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Juris Ulmanis, S. Häfner, R. Pires +4 more

We study Efimov resonances via three-body loss in an ultracold two-component gas of fermionic $^{6}\mathrm{Li}$ and bosonic $^{133}\mathrm{Cs}$ atoms close to a Feshbach resonance at 843 G, extending results reported previously [Pires et al., Phys. Rev. Lett. 112, 250404 (2014)] to temperatures around 120 nK. The experimental scheme for reaching lower temperatures is based upon compensating the gravity-induced spatial separation of the mass-imbalanced gases with bichromatic optical dipole traps. We observe the first and second excited Li-Cs-Cs Efimov resonance in the magnetic field dependence of the three-body event rate constant, in good agreement with the universal zero-range theory at finite temperature [Petrov and Werner, Phys. Rev. A 92, 022704 (2015)]. Deviations are found for the Efimov ground state, and the inelasticity parameter $\ensuremath{\eta}$ is found to be significantly larger than those for single-species systems.We study Efimov resonances via three-body loss in an ultracold two-component gas of fermionic $^{6}\mathrm{Li}$ and bosonic $^{133}\mathrm{Cs}$ atoms close to a Feshbach resonance at 843 G, extending results reported previously [Pires et al., Phys. Rev. Lett. 112, 250404 (2014)] to temperatures around 120 nK. The experimental scheme for reaching lower temperatures is based upon compensating the gravity-induced spatial separation of the mass-imbalanced gases with bichromatic optical dipole traps. We observe the first and second excited Li-Cs-Cs Efimov resonance in the magnetic field dependence of the three-body event rate constant, in good agreement with the universal zero-range theory at finite temperature [Petrov and Werner, Phys. Rev. A 92, 022704 (2015)]. Deviations are found for the Efimov ground state, and the inelasticity parameter $\ensuremath{\eta}$ is found to be significantly larger than those for single-species systems.

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Ruth Bloom, Ming-Guang Hu, Tyler D. Cumby +1 more

Recent measurements of Efimov resonances for a number of ultracold atom species have revealed an unexpected universality, in which three-body scattering properties are determined by the van der Waals length of the two-body interaction potential. To investigate whether this universality extends to heteronuclear mixtures, we measure loss rate coefficients in an ultracold trapped gas of 40K and 87Rb atoms. We find an Efimov-like resonance in the rate of inelastic collisions between 40K87Rb Feshbach molecules and 87Rb atoms. However, we do not observe any Efimov-related resonances in the rates of inelastic collisions between three atoms. These observations are compared to previous measurements by the LENS group of Efimov resonances in a 41K and 87Rb mixture as well as to recent predictions.Recent measurements of Efimov resonances for a number of ultracold atom species have revealed an unexpected universality, in which three-body scattering properties are determined by the van der Waals length of the two-body interaction potential. To investigate whether this universality extends to heteronuclear mixtures, we measure loss rate coefficients in an ultracold trapped gas of 40K and 87Rb atoms. We find an Efimov-like resonance in the rate of inelastic collisions between 40K87Rb Feshbach molecules and 87Rb atoms. However, we do not observe any Efimov-related resonances in the rates of inelastic collisions between three atoms. These observations are compared to previous measurements by the LENS group of Efimov resonances in a 41K and 87Rb mixture as well as to recent predictions.

arXiv:1304.6989Physical Review LettersSep 3, 2013121 citations

Three-Body Recombination at Vanishing Scattering Lengths in an Ultracold Bose Gas

Zav Shotan, Olga Machtey, S. J. J. M. F. Kokkelmans +1 more

We report on measurements of three-body recombination loss rates in an ultracold gas of ^{7}Li atoms in the extremely nonuniversal regime where the two-body scattering length vanishes. We show that the loss rate coefficient is well defined and can be described by two-body parameters only: the scattering length a and the effective range R_{e}. We find the rate to be energy independent, and, by connecting our results with previously reported measurements in the universal limit, we cover the behavior of the three-body recombination rate in the whole range from weak to strong two-body interactions. We identify a nontrivial magnetic field value in the nonuniversal regime where the rate should be suppressed.We report on measurements of three-body recombination loss rates in an ultracold gas of ^{7}Li atoms in the extremely nonuniversal regime where the two-body scattering length vanishes. We show that the loss rate coefficient is well defined and can be described by two-body parameters only: the scattering length a and the effective range R_{e}. We find the rate to be energy independent, and, by connecting our results with previously reported measurements in the universal limit, we cover the behavior of the three-body recombination rate in the whole range from weak to strong two-body interactions. We identify a nontrivial magnetic field value in the nonuniversal regime where the rate should be suppressed.

arXiv:1404.3575Physical Review LettersJul 31, 201445 citations

We report on the observation of a conspicuous loss in an ultracold mixture of

^{7}

Li and

^{88}

K_3

T\sim 18.5,45,70,600

μK

s

-wave scattering length between the bosonic

^{7}

Li and

^{88}

Sr atoms, and essentially rules out the prospect of realizing

^7

Li and

^{88}

Sr mixtures of high phase space density.

We report on the observation of a conspicuous loss in an ultracold mixture of

^{7}\mathrm{Li}

and

^{88}\mathrm{Sr}

atoms confined in a far-off-resonance optical dipole trap. We attribute the trap loss to the three-body inelastic Li-Sr-Sr collision and extract the corresponding three-body-recombination coefficient

{K}_{3}

at $T\ensuremath{\sim}18.5,45,70,600\phantom{\rule{0.28em}{0ex}}\textmu{}\mathrm{K}$. The measured three-body-recombination coefficient is about two to three orders of magnitude larger than the typical values convenient for realizing quantum degenerate gases, and essentially rules out the prospect of realizing

^{7}\mathrm{Li}

and

^{88}\mathrm{Sr}

mixtures of high phase space density. The measured three-body-recombination rates agree with the unitarity limit at high temperatures. Our results also confirm that the three-body-recombination loss is dominated by the light-heavy-heavy process, in agreement with the prediction for a system with a large mass-imbalanced and negligible intraspecies interaction.

The authors report the production of a quantum degenerate mixture of alkali-metal

{}^{6}

Li and alkaline-earth-metal

{}^{84}

Sr atoms in a far-off-resonant optical dipole trap. The results could pave the way for studying lithium-strontium polar molecules.

We report on the observation of two Feshbach resonances in collisions between ultracold

^{6}\mathrm{Li}

and

^{87}\mathrm{Rb}

atoms in their respective hyperfine ground states $\ensuremath{\mid}F,{m}_{F}⟩=\ensuremath{\mid}1∕2,1∕2⟩$ and \ensuremath{\mid}1,1⟩. The resonances show up as trap losses for the

^{6}\mathrm{Li}

cloud induced by inelastic Li-Rb-Rb three-body collisions. The magnetic field values where they occur represent important benchmarks for an accurate determination of the interspecies interaction potentials. A broad Feshbach resonance located at

1066.92\phantom{\rule{0.3em}{0ex}}\mathrm{G}

opens interesting prospects for the creation of ultracold heteronuclear molecules. We furthermore observe a strong enhancement of the narrow

p

-wave Feshbach resonance in collisions of

^{6}\mathrm{Li}

atoms at

158.55\phantom{\rule{0.3em}{0ex}}\mathrm{G}

in the presence of a dense

^{87}\mathrm{Rb}

cloud. The effect of the

^{87}\mathrm{Rb}

cloud is to introduce Li-Li-Rb three-body collisions occurring at a higher rate than Li-Li-Li collisions.

We study Efimov resonances via three-body loss in an ultracold two-component gas of fermionic

^{6}\mathrm{Li}

and bosonic

^{133}\mathrm{Cs}

atoms close to a Feshbach resonance at 843 G, extending results reported previously [Pires et al., Phys. Rev. Lett. 112, 250404 (2014)] to temperatures around 120 nK. The experimental scheme for reaching lower temperatures is based upon compensating the gravity-induced spatial separation of the mass-imbalanced gases with bichromatic optical dipole traps. We observe the first and second excited Li-Cs-Cs Efimov resonance in the magnetic field dependence of the three-body event rate constant, in good agreement with the universal zero-range theory at finite temperature [Petrov and Werner, Phys. Rev. A 92, 022704 (2015)]. Deviations are found for the Efimov ground state, and the inelasticity parameter $\ensuremath{\eta}$ is found to be significantly larger than those for single-species systems.