Physical Review A

Giant Feshbach resonances in Li6 - Rb85 mixtures

Benjamin Deh, Will Gunton, Bruce G. Klappauf, Z. Li, Mariusz Semczuk, Janelle Van Dongen, Kirk W. Madison

Published Aug 10, 2010• 46 citations

Abstract

We report on the observation of six large Feshbach resonances in a Fermi-Bose mixture of $^{6}\mathrm{Li}$ and $^{85}\mathrm{Rb}$ atoms. Near the resonances, both the elastic and inelastic collision rates are enhanced, and this results primarily in the loss of $^{6}\mathrm{Li}$ from an optical dipole trap since it is less massive and less confined than its $^{85}\mathrm{Rb}$ collision partner. We interpret our experimental data using a coupled-channels calculation which fully characterizes the ground-state scattering properties in any combination of spin states.

DOI: 10.1103/physreva.82.020701

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Physical Review A

Giant Feshbach resonances in Li6 - Rb85 mixtures

Benjamin Deh, Will Gunton, Bruce G. Klappauf, Z. Li, Mariusz Semczuk, Janelle Van Dongen, Kirk W. Madison

Published Aug 10, 2010• 46 citations

Publisher

Abstract

We report on the observation of six large Feshbach resonances in a Fermi-Bose mixture of

^{6}\mathrm{Li}

and

^{85}\mathrm{Rb}

atoms. Near the resonances, both the elastic and inelastic collision rates are enhanced, and this results primarily in the loss of

^{6}\mathrm{Li}

from an optical dipole trap since it is less massive and less confined than its

^{85}\mathrm{Rb}

collision partner. We interpret our experimental data using a coupled-channels calculation which fully characterizes the ground-state scattering properties in any combination of spin states.

DOI: 10.1103/physreva.82.020701

Related papers

Observation of a broad state-to-state spin-exchange collision near a p-wave Feshbach resonances of $^6$ Li atomsObservation of a broad state-to-state spin-exchange collision near a p-wave Feshbach resonances of $^6$Li atoms

Shuai Peng, Tangqian Shu, Bo-Wen Si +6 more

The study of state-to-state spin-exchange collisions in the vicinity of $p$ -wave Feshbach resonances offer great opportunities to explore many-body interactions and novel quantum phases. Here, we report the observation of a spin-exchange collision near a $p$ -wave Feshbach resonance within a mixture of the lowest and third-lowest hyperfine states of $^6$ Li atoms. The spin-exchange interaction is observed over a range of ten gausses and produces a pair of atoms in the second-lowest hyperfine states that are captured by a deep optical dipole trap. We apply a coupled-channel method to calculate the scattering properties of this system. We find that the $p$ -wave resonance exhibits a low inelastic collision rate and a broad resonance profile, which is due to the modification by the accompanying spin-exchange collisions. These findings open up new possibilities for the creation of long-lived, strongly interacting $p$ -wave Fermi gases.The study of state-to-state spin-exchange collisions in the vicinity of $p$-wave Feshbach resonances offer great opportunities to explore many-body interactions and novel quantum phases. Here, we report the observation of a spin-exchange collision near a $p$-wave Feshbach resonance within a mixture of the lowest and third-lowest hyperfine states of $^6$Li atoms. The spin-exchange interaction is observed over a range of ten gausses and produces a pair of atoms in the second-lowest hyperfine states that are captured by a deep optical dipole trap. We apply a coupled-channel method to calculate the scattering properties of this system. We find that the $p$-wave resonance exhibits a low inelastic collision rate and a broad resonance profile, which is due to the modification by the accompanying spin-exchange collisions. These findings open up new possibilities for the creation of long-lived, strongly interacting $p$-wave Fermi gases.

arXiv:2406.01248Jun 3, 20240 citations

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E. Wille, F. M. Spiegelhalder, Gabriel Kerner +10 more

arXiv:0711.2916Physical Review LettersFeb 5, 2008313 citations

Observation of interspecies 6 Li- 133 Cs Feshbach resonances

M. Repp, R. Pires, Juris Ulmanis +4 more

We report on the observation of 19 interspecies Feshbach resonances in an optically trapped ultracold Bose-Fermi mixture of ${}^{133}\text{Cs}$ and ${}^{6}\text{Li}$ in the two energetically lowest spin states. We assign the resonances to $s$ - and $p$ -wave molecular channels by a coupled-channels calculation, resulting in an accurate determination of LiCs ground-state potentials. Fits of the resonance position based on the undressed asymptotic bound state model do not provide the same level of accuracy as the coupled-channels calculation. Several broad $s$ -wave resonances provide prospects to create fermionic LiCs molecules with a large dipole moment via Feshbach association followed by stimulated Raman passage. Two of the $s$ -wave resonances overlap with a zero crossing of the Cs scattering length, which offers prospects for the investigation of polarons in an ultracold Li-Cs mixture.We report on the observation of 19 interspecies Feshbach resonances in an optically trapped ultracold Bose-Fermi mixture of ${}^{133}\text{Cs}$ and ${}^{6}\text{Li}$ in the two energetically lowest spin states. We assign the resonances to $s$- and $p$-wave molecular channels by a coupled-channels calculation, resulting in an accurate determination of LiCs ground-state potentials. Fits of the resonance position based on the undressed asymptotic bound state model do not provide the same level of accuracy as the coupled-channels calculation. Several broad $s$-wave resonances provide prospects to create fermionic LiCs molecules with a large dipole moment via Feshbach association followed by stimulated Raman passage. Two of the $s$-wave resonances overlap with a zero crossing of the Cs scattering length, which offers prospects for the investigation of polarons in an ultracold Li-Cs mixture.

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Feshbach resonances in an ultracold Li 7 and Rb 87 mixture

C. Marzok, Benjamin Deh, Claus Zimmermann +4 more

We report on the observation of five Feshbach resonances in collisions between ultracold $^{7}\mathrm{Li}$ and $^{87}\mathrm{Rb}$ atoms in the absolute ground-state mixture where both species are in their $\ensuremath{\mid}f,{m}_{f}⟩=\ensuremath{\mid}1,1⟩$ hyperfine states. The resonances appear as trap losses for the $^{7}\mathrm{Li}$ cloud induced by inelastic heteronuclear three-body collisions. The magnetic field values where they occur are important quantities for an accurate determination of the interspecies interaction potentials. Results of coupled channels calculations based on the observed resonances are presented and refined potential parameters are given. A very broad Feshbach resonance centered around $649\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ should allow for fine-tuning of the interaction strength in future experiments.We report on the observation of five Feshbach resonances in collisions between ultracold $^{7}\mathrm{Li}$ and $^{87}\mathrm{Rb}$ atoms in the absolute ground-state mixture where both species are in their $\ensuremath{\mid}f,{m}_{f}⟩=\ensuremath{\mid}1,1⟩$ hyperfine states. The resonances appear as trap losses for the $^{7}\mathrm{Li}$ cloud induced by inelastic heteronuclear three-body collisions. The magnetic field values where they occur are important quantities for an accurate determination of the interspecies interaction potentials. Results of coupled channels calculations based on the observed resonances are presented and refined potential parameters are given. A very broad Feshbach resonance centered around $649\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ should allow for fine-tuning of the interaction strength in future experiments.

arXiv:0808.3967Physical Review AJan 29, 200960 citations

We report on the observation of six large Feshbach resonances in a Fermi-Bose mixture of

^{6}\mathrm{Li}

and

^{85}\mathrm{Rb}

atoms. Near the resonances, both the elastic and inelastic collision rates are enhanced, and this results primarily in the loss of

^{6}\mathrm{Li}

from an optical dipole trap since it is less massive and less confined than its

^{85}\mathrm{Rb}

collision partner. We interpret our experimental data using a coupled-channels calculation which fully characterizes the ground-state scattering properties in any combination of spin states.

Observation of a broad state-to-state spin-exchange collision near a p-wave Feshbach resonances of

^6

Li atoms

The study of state-to-state spin-exchange collisions in the vicinity of

p

-wave Feshbach resonances offer great opportunities to explore many-body interactions and novel quantum phases. Here, we report the observation of a spin-exchange collision near a

p

-wave Feshbach resonance within a mixture of the lowest and third-lowest hyperfine states of

^6

Li atoms. The spin-exchange interaction is observed over a range of ten gausses and produces a pair of atoms in the second-lowest hyperfine states that are captured by a deep optical dipole trap. We apply a coupled-channel method to calculate the scattering properties of this system. We find that the

p

-wave resonance exhibits a low inelastic collision rate and a broad resonance profile, which is due to the modification by the accompanying spin-exchange collisions. These findings open up new possibilities for the creation of long-lived, strongly interacting

p

-wave Fermi gases.

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 19 interspecies Feshbach resonances in an optically trapped ultracold Bose-Fermi mixture of

{}^{133}\text{Cs}

and

{}^{6}\text{Li}

in the two energetically lowest spin states. We assign the resonances to

s

- and

p

-wave molecular channels by a coupled-channels calculation, resulting in an accurate determination of LiCs ground-state potentials. Fits of the resonance position based on the undressed asymptotic bound state model do not provide the same level of accuracy as the coupled-channels calculation. Several broad

s

-wave resonances provide prospects to create fermionic LiCs molecules with a large dipole moment via Feshbach association followed by stimulated Raman passage. Two of the

s

-wave resonances overlap with a zero crossing of the Cs scattering length, which offers prospects for the investigation of polarons in an ultracold Li-Cs mixture.

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

^{7}\mathrm{Li}

and

^{87}\mathrm{Rb}

atoms in the absolute ground-state mixture where both species are in their $\ensuremath{\mid}f,{m}_{f}⟩=\ensuremath{\mid}1,1⟩$ hyperfine states. The resonances appear as trap losses for the

^{7}\mathrm{Li}

cloud induced by inelastic heteronuclear three-body collisions. The magnetic field values where they occur are important quantities for an accurate determination of the interspecies interaction potentials. Results of coupled channels calculations based on the observed resonances are presented and refined potential parameters are given. A very broad Feshbach resonance centered around

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

should allow for fine-tuning of the interaction strength in future experiments.