arXiv:cond-mat/0406129 · Physical Review Letters

Observation of Feshbach Resonances between Two Different Atomic Species

Claudiu A. Stan, Martin W. Zwierlein, Christian H. Schunck, S. M. F. Raupach, Wolfgang Ketterle

Published Sep 30, 2004• 270 citations

Abstract

We have observed three Feshbach resonances in collisions between $^{6}\mathrm{L}\mathrm{i}$ and $^{23}\mathrm{N}\mathrm{a}$ atoms. The resonances were identified as narrow loss features when the magnetic field was varied. The molecular states causing these resonances have been identified, and additional $^{6}\mathrm{L}\mathrm{i}\mathrm{\text{\ensuremath{-}}}^{23}\mathrm{N}\mathrm{a}$ resonances are predicted. These resonances will allow the study of degenerate Bose-Fermi mixtures with adjustable interactions and could be used to generate ultracold heteronuclear molecules.

DOI: 10.1103/physrevlett.93.143001

Related papers

Observation of Heteronuclear Feshbach Resonances in a Mixture of Bosons and Fermions

S. Inouye, J. Goldwin, M. L. Olsen +3 more

arXiv:cond-mat/0406208Physical Review LettersOct 25, 2004307 citations

Feshbach resonances in mixtures of ultracold Li6 and Rb87 gases

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

arXiv:0709.4554Physical Review AJan 8, 200884 citations

Feshbach resonances in an ultracold Li 7 and Rb 87 mixture

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

arXiv:0808.3967Physical Review AJan 29, 200960 citations

K40−Rb87 Feshbach resonances: Modeling the interatomic potential

Carsten Klempt, T. Henninger, O. Topic +4 more

arXiv:0706.0240Physical Review AAug 23, 200742 citations

Observation of Feshbach resonances between ultracold Na and Rb atoms

Fudong Wang, Dezhi Xiong, Xiaoke Li +2 more

arXiv:1303.0334Physical Review AMay 30, 201352 citations

Observation of magnetically tunable Feshbach resonances in ultracold 23 Na 40 K + 40 K collisions

H. X. Yang, De-Chao Zhang, Lan Liu +4 more

arXiv:1807.11160ScienceJan 18, 2019165 citations

arXiv:cond-mat/0406129 · Physical Review Letters

Observation of Feshbach Resonances between Two Different Atomic Species

Claudiu A. Stan, Martin W. Zwierlein, Christian H. Schunck, S. M. F. Raupach, Wolfgang Ketterle

Published Sep 30, 2004• 270 citations

arXiv HTML PDF

Abstract

We have observed three Feshbach resonances in collisions between

^{6}\mathrm{L}\mathrm{i}

and

^{23}\mathrm{N}\mathrm{a}

atoms. The resonances were identified as narrow loss features when the magnetic field was varied. The molecular states causing these resonances have been identified, and additional

^{6}\mathrm{L}\mathrm{i}\mathrm{\text{\ensuremath{-}}}^{23}\mathrm{N}\mathrm{a}

resonances are predicted. These resonances will allow the study of degenerate Bose-Fermi mixtures with adjustable interactions and could be used to generate ultracold heteronuclear molecules.

DOI: 10.1103/physrevlett.93.143001

Related papers

Observation of Heteronuclear Feshbach Resonances in a Mixture of Bosons and Fermions

S. Inouye, J. Goldwin, M. L. Olsen +3 more

Three magnetic-field induced heteronuclear Feshbach resonances were identified in collisions between bosonic $^{87}\mathrm{R}\mathrm{b}$ and fermionic $^{40}\mathrm{K}$ atoms in their absolute ground states. Strong inelastic loss from an optically trapped mixture was observed at the resonance positions of 492, 512, and $543\ifmmode\pm\else\textpm\fi{}2\text{ }\text{ }\mathrm{G}$. The magnetic-field locations of these resonances place a tight constraint on the triplet and singlet cross-species scattering lengths, yielding $(\ensuremath{-}281\ifmmode\pm\else\textpm\fi{}15){a}_{0}$ and $(\ensuremath{-}54\ifmmode\pm\else\textpm\fi{}12){a}_{0}$, respectively. The width of the loss feature at 543 G is $3.7\ifmmode\pm\else\textpm\fi{}1.5\text{ }\text{ }\mathrm{G}$ wide; this broad Feshbach resonance should enable experimental control of the interspecies interactions.Three magnetic-field induced heteronuclear Feshbach resonances were identified in collisions between bosonic $^{87}\mathrm{R}\mathrm{b}$ and fermionic $^{40}\mathrm{K}$ atoms in their absolute ground states. Strong inelastic loss from an optically trapped mixture was observed at the resonance positions of 492, 512, and $543\ifmmode\pm\else\textpm\fi{}2\text{ }\text{ }\mathrm{G}$. The magnetic-field locations of these resonances place a tight constraint on the triplet and singlet cross-species scattering lengths, yielding $(\ensuremath{-}281\ifmmode\pm\else\textpm\fi{}15){a}_{0}$ and $(\ensuremath{-}54\ifmmode\pm\else\textpm\fi{}12){a}_{0}$, respectively. The width of the loss feature at 543 G is $3.7\ifmmode\pm\else\textpm\fi{}1.5\text{ }\text{ }\mathrm{G}$ wide; this broad Feshbach resonance should enable experimental control of the interspecies interactions.

arXiv:cond-mat/0406208Physical Review LettersOct 25, 2004307 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

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

K40−Rb87 Feshbach resonances: Modeling the interatomic potential

Carsten Klempt, T. Henninger, O. Topic +4 more

We have observed 28 heteronuclear Feshbach resonances in ten spin combinations of the hyperfine ground states of a $^{40}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ mixture. The measurements were performed by observing the loss rates from an atomic mixture at magnetic fields between $0$ and $700\phantom{\rule{0.3em}{0ex}}\mathrm{G}$ . These data were used to significantly refine an interatomic potential derived from molecular spectroscopy, yielding a highly consistent model of the $^{40}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ interaction. Thus, the measured resonances can be assigned to the corresponding molecular states. In addition, this potential allows for an accurate calculation of the energy differences between highly excited levels and the rovibrational ground level. This information is of particular relevance for the formation of deeply bound heteronuclear molecules. Finally, the model is used to predict Feshbach resonances in mixtures of $^{87}\mathrm{Rb}$ combined with $^{39}\mathrm{K}$ or $^{41}\mathrm{K}$ .We have observed 28 heteronuclear Feshbach resonances in ten spin combinations of the hyperfine ground states of a $^{40}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ mixture. The measurements were performed by observing the loss rates from an atomic mixture at magnetic fields between $0$ and $700\phantom{\rule{0.3em}{0ex}}\mathrm{G}$. These data were used to significantly refine an interatomic potential derived from molecular spectroscopy, yielding a highly consistent model of the $^{40}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ interaction. Thus, the measured resonances can be assigned to the corresponding molecular states. In addition, this potential allows for an accurate calculation of the energy differences between highly excited levels and the rovibrational ground level. This information is of particular relevance for the formation of deeply bound heteronuclear molecules. Finally, the model is used to predict Feshbach resonances in mixtures of $^{87}\mathrm{Rb}$ combined with $^{39}\mathrm{K}$ or $^{41}\mathrm{K}$.

arXiv:0706.0240Physical Review AAug 23, 200742 citations

Observation of Feshbach resonances between ultracold Na and Rb atoms

Fudong Wang, Dezhi Xiong, Xiaoke Li +2 more

We have successfully prepared an optically trapped ultracold mixture of ${}^{23}$ Na and ${}^{87}$ Rb atoms and studied their interspecies Feshbach resonances. Using two different spin combinations, several $s$ - and $p$ -wave resonances are identified by observing high inelastic losses and temperature increases for both species near resonant magnetic field values. The two $s$ -wave resonances observed below 500 G between atoms in their lowest-energy levels are possible candidates for Feshbach molecule association. Our results are well characterized by a coupled-channel model which also refines the ground-state interaction potentials between ${}^{23}$ Na and ${}^{87}$ Rb. This work opens up the prospect for preparing ultracold ensembles of ground-state bosonic NaRb molecules which are chemically stable and can provide strong dipolar interactions.We have successfully prepared an optically trapped ultracold mixture of ${}^{23}$Na and ${}^{87}$Rb atoms and studied their interspecies Feshbach resonances. Using two different spin combinations, several $s$- and $p$-wave resonances are identified by observing high inelastic losses and temperature increases for both species near resonant magnetic field values. The two $s$-wave resonances observed below 500 G between atoms in their lowest-energy levels are possible candidates for Feshbach molecule association. Our results are well characterized by a coupled-channel model which also refines the ground-state interaction potentials between ${}^{23}$Na and ${}^{87}$Rb. This work opens up the prospect for preparing ultracold ensembles of ground-state bosonic NaRb molecules which are chemically stable and can provide strong dipolar interactions.

arXiv:1303.0334Physical Review AMay 30, 201352 citations

Observation of magnetically tunable Feshbach resonances in ultracold 23 Na 40 K + 40 K collisions

H. X. Yang, De-Chao Zhang, Lan Liu +4 more

K) molecules in the rovibrational ground state. We prepare the atoms and molecules in various hyperfine levels of their ground states and observe the loss of molecules as a function of the magnetic field. The atom-molecule Feshbach resonances are identified by observing an enhancement of the loss. We have observed 11 resonances in the magnetic field range of 43 to 120 gauss. The observed atom-molecule Feshbach resonances at ultralow temperatures probe the three-body potential energy surface with exceptional resolution and will help to improve understanding of ultracold collisions.K) molecules in the rovibrational ground state. We prepare the atoms and molecules in various hyperfine levels of their ground states and observe the loss of molecules as a function of the magnetic field. The atom-molecule Feshbach resonances are identified by observing an enhancement of the loss. We have observed 11 resonances in the magnetic field range of 43 to 120 gauss. The observed atom-molecule Feshbach resonances at ultralow temperatures probe the three-body potential energy surface with exceptional resolution and will help to improve understanding of ultracold collisions.

arXiv:1807.11160ScienceJan 18, 2019165 citations

We have observed three Feshbach resonances in collisions between

^{6}\mathrm{L}\mathrm{i}

and

^{23}\mathrm{N}\mathrm{a}

atoms. The resonances were identified as narrow loss features when the magnetic field was varied. The molecular states causing these resonances have been identified, and additional

^{6}\mathrm{L}\mathrm{i}\mathrm{\text{\ensuremath{-}}}^{23}\mathrm{N}\mathrm{a}

resonances are predicted. These resonances will allow the study of degenerate Bose-Fermi mixtures with adjustable interactions and could be used to generate ultracold heteronuclear molecules.

Three magnetic-field induced heteronuclear Feshbach resonances were identified in collisions between bosonic

^{87}\mathrm{R}\mathrm{b}

and fermionic

^{40}\mathrm{K}

atoms in their absolute ground states. Strong inelastic loss from an optically trapped mixture was observed at the resonance positions of 492, 512, and $543\ifmmode\pm\else\textpm\fi{}2\text{ }\text{ }\mathrm{G}$. The magnetic-field locations of these resonances place a tight constraint on the triplet and singlet cross-species scattering lengths, yielding $(\ensuremath{-}281\ifmmode\pm\else\textpm\fi{}15){a}_{0}$ and $(\ensuremath{-}54\ifmmode\pm\else\textpm\fi{}12){a}_{0}$, respectively. The width of the loss feature at 543 G is $3.7\ifmmode\pm\else\textpm\fi{}1.5\text{ }\text{ }\mathrm{G}$ wide; this broad Feshbach resonance should enable experimental control of the interspecies interactions.

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 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.

0

and

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

. These data were used to significantly refine an interatomic potential derived from molecular spectroscopy, yielding a highly consistent model of the $^{40}\mathrm{K}\text{\ensuremath{-}}^{87}\mathrm{Rb}$ interaction. Thus, the measured resonances can be assigned to the corresponding molecular states. In addition, this potential allows for an accurate calculation of the energy differences between highly excited levels and the rovibrational ground level. This information is of particular relevance for the formation of deeply bound heteronuclear molecules. Finally, the model is used to predict Feshbach resonances in mixtures of

^{87}\mathrm{Rb}

combined with

^{39}\mathrm{K}

^{41}\mathrm{K}

We have successfully prepared an optically trapped ultracold mixture of

{}^{23}

Na and

{}^{87}

Rb atoms and studied their interspecies Feshbach resonances. Using two different spin combinations, several

s

- and

p

-wave resonances are identified by observing high inelastic losses and temperature increases for both species near resonant magnetic field values. The two

s

-wave resonances observed below 500 G between atoms in their lowest-energy levels are possible candidates for Feshbach molecule association. Our results are well characterized by a coupled-channel model which also refines the ground-state interaction potentials between

{}^{23}

Na and

{}^{87}

Rb. This work opens up the prospect for preparing ultracold ensembles of ground-state bosonic NaRb molecules which are chemically stable and can provide strong dipolar interactions.