Physical Review A

Observation of a broad state-to-state spin-exchange collision near a p -wave Feshbach resonance of Li 6 atoms

Shuai Peng, Tangqian Shu, Bowen Si, Sijia Peng, Yixin Guo, Yong‐Chang Han, Jiaming Li, Gao‐Ren Wang, Le Luo

Published Nov 12, 2024• 6 citations

Abstract

The authors investigate spin-exchange collisions near a $p$-wave Feshbach resonance in ${}^{6}$Li atoms, observing an interaction range of approximately 10G that produces atom pairs in the second-lowest hyperfine state, held in a stable optical trap. Coupled-channel calculations reveal a broad resonance profile and low inelastic collision rate, opening possibilities for long-lived, strongly interacting $p$-wave Fermi gases.

DOI: 10.1103/physreva.110.l051301

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Physical Review A

Observation of a broad state-to-state spin-exchange collision near a p -wave Feshbach resonance of Li 6 atoms

Shuai Peng, Tangqian Shu, Bowen Si, Sijia Peng, Yixin Guo, Yong‐Chang Han, Jiaming Li, Gao‐Ren Wang, Le Luo

Published Nov 12, 2024• 6 citations

Publisher

Abstract

The authors investigate spin-exchange collisions near a

p

-wave Feshbach resonance in

{}^{6}

Li atoms, observing an interaction range of approximately 10G that produces atom pairs in the second-lowest hyperfine state, held in a stable optical trap. Coupled-channel calculations reveal a broad resonance profile and low inelastic collision rate, opening possibilities for long-lived, strongly interacting

p

-wave Fermi gases.

DOI: 10.1103/physreva.110.l051301

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

Feshbach resonances in mixtures of ultracold Li6 and Rb87 gases

Benjamin Deh, C. Marzok, Claus Zimmermann +1 more

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.

arXiv:0709.4554Physical Review AJan 8, 200884 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.

arXiv:1211.2139Physical Review AJan 3, 201399 citations

Giant Feshbach resonances in Li6 - Rb85 mixtures

Benjamin Deh, Will Gunton, Bruce G. Klappauf +4 more

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.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.

Physical Review AAug 10, 201046 citations

Feshbach Resonances in p -Wave Three-Body Recombination within Fermi-Fermi Mixtures of Open-Shell Li6 and Closed-Shell Yb173 Atoms

Alaina Green, Hui Li, Jun Hui See Toh +6 more

We report on the observation of magnetic Feshbach resonances in a Fermi-Fermi mixture of ultracold atoms with extreme mass imbalance and on their unique p-wave dominated three-body recombination processes.Our system consists of open-shell alkali-metal 6 Li and closed-shell 173 Yb atoms, both spin polarized and held at various temperatures between 1 and 20 μK.We confirm that Feshbach resonances in this system are solely the result of a weak separation-dependent hyperfine coupling between the electronic spin of 6 Li and the nuclear spin of 173 Yb.Our analysis also shows that three-body recombination rates are controlled by the identical fermion nature of the mixture, even in the presence of s-wave collisions between the two species and with recombination rate coefficients outside the Wigner threshold regime at our lowest temperature.Specifically, a comparison of experimental and theoretical line shapes of the recombination process indicates that the characteristic asymmetric line shape as a function of applied magnetic field and a maximum recombination rate coefficient that is independent of temperature can only be explained by triatomic collisions with nonzero, p-wave total orbital angular momentum.The resonances can be used to form ultracold doublet ground-state molecules and to simulate quantum superfluidity in mass-imbalanced mixtures.We report on the observation of magnetic Feshbach resonances in a Fermi-Fermi mixture of ultracold atoms with extreme mass imbalance and on their unique p-wave dominated three-body recombination processes.Our system consists of open-shell alkali-metal 6 Li and closed-shell 173 Yb atoms, both spin polarized and held at various temperatures between 1 and 20 μK.We confirm that Feshbach resonances in this system are solely the result of a weak separation-dependent hyperfine coupling between the electronic spin of 6 Li and the nuclear spin of 173 Yb.Our analysis also shows that three-body recombination rates are controlled by the identical fermion nature of the mixture, even in the presence of s-wave collisions between the two species and with recombination rate coefficients outside the Wigner threshold regime at our lowest temperature.Specifically, a comparison of experimental and theoretical line shapes of the recombination process indicates that the characteristic asymmetric line shape as a function of applied magnetic field and a maximum recombination rate coefficient that is independent of temperature can only be explained by triatomic collisions with nonzero, p-wave total orbital angular momentum.The resonances can be used to form ultracold doublet ground-state molecules and to simulate quantum superfluidity in mass-imbalanced mixtures.

arXiv:1912.04874Physical Review XAug 14, 202055 citations

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

The authors investigate spin-exchange collisions near a

p

-wave Feshbach resonance in

{}^{6}

p

-wave Fermi gases.

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 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.

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.